diff --git a/Project.toml b/Project.toml
index 97b9729c..c23a2e3c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "Gtk4"
 uuid = "9db2cae5-386f-4011-9d63-a5602296539b"
-version = "0.5.2"
+version = "0.5.3"
 
 [deps]
 BitFlags = "d1d4a3ce-64b1-5f1a-9ba4-7e7e69966f35"
diff --git a/docs/src/manual/gettingStarted.md b/docs/src/manual/gettingStarted.md
index 79de0d27..a953e4ba 100644
--- a/docs/src/manual/gettingStarted.md
+++ b/docs/src/manual/gettingStarted.md
@@ -16,10 +16,6 @@ We will now go through this example step by step. First the package is loaded `u
 ```julia
 push!(win,b)
 ```
-Since a `GtkWindow` can have only one child widget, we could have added the button to the window using
-```julia
-win[] = b
-```
 Finally, `show(win)` makes the window visible.
 This could also have been accomplished using the `visible` property (properties of "GObjects" like `GtkWindow` are discussed on the [Properties](../manual/properties.md) section of this manual).
 
@@ -49,3 +45,35 @@ function on_button_clicked(w)
 end
 signal_connect(on_button_clicked, b, "clicked")
 ```
+
+## The hierarchy of widgets
+
+In the example above, `GtkWindow` and `GtkButton` are GTK "widgets", which represent GUI elements. 
+Widgets are arranged in a hierarchy, with a `GtkWindow` at the top level (typically), inside which are widgets that contain other widgets.
+A widget in this hierarchy can have child widgets and a parent widget.
+The parent widget can be found using the method `parent`:
+```julia
+julia> parent(b) == win
+true
+```
+The toplevel widget in a particular widget's hierarchy can be found using the method `toplevel`:
+```julia
+julia> toplevel(b) == win
+true
+```
+Iterating over a widget gives you its child widgets:
+```julia
+for child in widget
+    myfunc(child)
+end
+```
+
+Widgets can be added and removed using interface methods defined by Gtk4.jl.
+For many widgets that can contain children, `push!` is defined to append a widget to another's children.
+Some widget types can only have one child.
+For this situation, Gtk4.jl defines `setindex!(w,x)` and `getindex(w)` methods with no arguments, which can be written as `w[] = x` and `output = w[]`, respectively.
+For example, a `GtkWindow` can have only one child widget, so we could have added the button to the window in our example using
+```julia
+win[] = b
+```
+
diff --git a/docs/src/manual/layout.md b/docs/src/manual/layout.md
index d97444e8..564e1d5f 100644
--- a/docs/src/manual/layout.md
+++ b/docs/src/manual/layout.md
@@ -7,7 +7,7 @@ Gtk4 provides many layout widgets for arranging widgets in a window.
 
 ## GtkBox
 
-The simplest layout widget is the `GtkBox`. It is one-dimensional and can be either be horizontally or vertical aligned.
+The layout widget used most often is `GtkBox`. It is one-dimensional and can be either be horizontally or vertical aligned.
 ```julia
 win = GtkWindow("New title")
 hbox = GtkBox(:h)  # :h makes a horizontal layout, :v a vertical layout
@@ -143,6 +143,17 @@ push!(nb, vbox, "Vertical")  # here "Vertical" is the label for the tab
 push!(nb, hbox, "Horizontal")
 ```
 
+Julia interface methods defined for `GtkNotebook`:
+
+| method | what it does |
+| :--- | :--- |
+| `push!(n::GtkNotebook, x::GtkWidget, label::AbstractString)` | Appends a widget with a label |
+| `push!(n::GtkNotebook, x::GtkWidget, label::GtkWidget)` | Appends a widget with a widget to be shown in the tab |
+| `pushfirst!(n::GtkNotebook, x::GtkWidget, label::AbstractString)` | Prepends a widget with a label |
+| `pushfirst!(n::GtkNotebook, x::GtkWidget, label::GtkWidget)` | Prepends a widget with a widget to be shown in the tab |
+| `deleteat!(n::GtkNotebook, x::GtkWidget)` | Removes a widget from the notebook |
+| `empty!(n::GtkNotebook)` | Removes all widgets from the notebook |
+
 ## GtkStack
 
 The `GtkStack` widget is a lot like `GtkNotebook`, but a separate widget `GtkStackSwitcher` controls what page is shown.
@@ -157,11 +168,34 @@ push!(s, GtkLabel("First label"), "id1", "Label 1")  # first string is an id, se
 push!(s, GtkLabel("Second label"), "id2", "Label 2") # widget can be retrieved using s[id]
 ```
 
+Julia interface methods defined for `GtkStack`:
+
+| method | what it does |
+| :--- | :--- |
+| `getindex(s::GtkStack, name::AbstractString)` or `s[name]` | Gets a widget by name |
+| `setindex!(s::GtkStack, x::GtkWidget, name::AbstractString)` or `s[name] = x` | Sets a widget by name |
+| `push!(s::GtkStack, x::GtkWidget)` | Appends a widget |
+| `push!(s::GtkStack, x::GtkWidget, name::AbstractString)` | Appends a widget with a name |
+| `push!(s::GtkStack, x::GtkWidget, name::AbstractString, title::AbstractString)` | Appends a widget with a name and a title |
+| `delete!(s::GtkStack, x::GtkWidget)` | Removes a widget from the stack |
+| `empty!(s::GtkStack)` | Removes all widgets from the stack |
+
+## GtkFrame, GtkAspectFrame, and GtkExpander
+
+These widgets hold one child widget. `GtkFrame` and `GtkAspectFrame` display them in a decorative frame with an optional label. `GtkExpander` allows the user to hide the child.
+
+Julia interface methods defined for `GtkFrame`, `GtkAspectFrame`, and `GtkExpander`:
+
+| method | what it does |
+| :--- | :--- |
+| `getindex(f)` or `f[]` | Gets the child widget |
+| `setindex!(f, w::Union{GtkWidget,Nothing})` or `f[] = w` | Sets or clears the child widget |
+
 ## Iterating over child widgets
 
 For any of the widgets described above (or any `GtkWidget` that has children), you can iterate over all child widgets using
 ```julia
-for w in widget
-    myfunc(w)
+for child in widget
+    myfunc(child)
 end
 ```
diff --git a/docs/src/manual/methods.md b/docs/src/manual/methods.md
index da00a97a..feafef32 100644
--- a/docs/src/manual/methods.md
+++ b/docs/src/manual/methods.md
@@ -22,7 +22,7 @@ Constants and struct definitions are also generated using GObject introspection.
 
 ## Constructors
 
-Constructor methods in `G_` are treated a little differently. They are named according to GObject_constructor_name, as in the following table:
+Constructor methods in `G_` are treated a little differently. They are named according to `GObject_$constructor_name`, as in the following table:
 
 | C function | Gtk4.G_ Julia method | Comments |
 | :--- | :--- | :--- |
diff --git a/src/GLib/actions.jl b/src/GLib/actions.jl
index 4a2241b2..57902583 100644
--- a/src/GLib/actions.jl
+++ b/src/GLib/actions.jl
@@ -21,13 +21,23 @@ function add_action(m::GActionMap, name::AbstractString, cb, user_data)
     action
 end
 
-function add_stateful_action(m::GActionMap, name::AbstractString, initial_state, handler::Function)
+function add_stateful_action(m::GActionMap, name::AbstractString, initial_state,
+                             handler::Function)
     action = GSimpleAction(name, nothing, GVariant(initial_state))
     push!(m,GAction(action))
     signal_connect(handler, action, :change_state)
     action
 end
 
+function add_stateful_action(m::GActionMap, name::AbstractString, initial_state,
+                             cb, user_data)
+    action = GSimpleAction(name, nothing, GVariant(initial_state))
+    push!(m,GAction(action))
+    signal_connect(cb, action, :change_state, Nothing,
+                   (Ptr{GVariant},), false, user_data)
+    action
+end
+
 # action groups
 push!(g::GSimpleActionGroup, a) = (push!(GActionMap(g), GAction(a)); g)
 delete!(g::GSimpleActionGroup, a::AbstractString) = (delete!(GActionMap(g), a); g)
diff --git a/src/base.jl b/src/base.jl
index 5233700d..3141ad24 100644
--- a/src/base.jl
+++ b/src/base.jl
@@ -121,6 +121,13 @@ Related GTK function: [`gtk_widget_activate`()]($(gtkdoc_method_url("gtk4","Widg
 """
 activate(w::GtkWidget) = G_.activate(w)
 
+"""
+    toplevels()
+    
+Returns a GListModel of all toplevel widgets (i.e. windows) known to GTK4.
+"""
+toplevels() = G_.get_toplevels()
+
 @doc """
     display(w::GtkWidget)
 
diff --git a/src/layout.jl b/src/layout.jl
index e4e41d0e..3880721e 100644
--- a/src/layout.jl
+++ b/src/layout.jl
@@ -226,6 +226,10 @@ function splice!(w::GtkNotebook, i::Integer)
     G_.remove_page(w, i - 1)
     w
 end
+function deleteat!(w::GtkNotebook, i::Integer)
+    G_.remove_page(w, i - 1)
+    w
+end
 
 pagenumber(w::GtkNotebook, child::GtkWidget) =
     G_.page_num(w, child) + 1
diff --git a/src/lists.jl b/src/lists.jl
index 90e324cd..fc769c17 100644
--- a/src/lists.jl
+++ b/src/lists.jl
@@ -108,6 +108,23 @@ function set_filter_func(lb::GtkListBox, match::Function)
     return nothing
 end
 
+## GtkFlowBox
+setindex!(fb::GtkFlowBox, w::GtkWidget, i::Integer) = (G_.insert(fb, w, i - 1); fb[i])
+getindex(fb::GtkFlowBox, i::Integer) = G_.get_child_at_index(fb, i - 1)
+
+push!(fb::GtkFlowBox, w::GtkWidget) = (G_.append(fb, w); fb)
+pushfirst!(fb::GtkFlowBox, w::GtkWidget) = (G_.prepend(fb, w); fb)
+insert!(fb::GtkFlowBox, i::Integer, w::GtkWidget) = (G_.insert(fb, w, i - 1); fb)
+
+delete!(fb::GtkFlowBox, w::GtkWidget) = (G_.remove(fb, w); fb)
+
+function set_filter_func(fb::GtkFlowBox, match::Function)
+    cfunc = @cfunction(GtkFlowBoxFilterFunc, Cint, (Ptr{GObject}, Ref{Function}))
+    ref, deref = GLib.gc_ref_closure(match)
+    ccall(("gtk_flow_box_set_filter_func", libgtk4), Nothing, (Ptr{GObject}, Ptr{Nothing}, Ptr{Nothing}, Ptr{Nothing}), fb, cfunc, ref, deref)
+    return nothing
+end
+
 
 ## GtkCustomFilter
 
@@ -119,7 +136,7 @@ function GtkCustomFilter(match::Function)
 end
 
 function set_filter_func(cf::GtkCustomFilter, match::Function)
-    cfunc = @cfunction(GtkListBoxFilterFunc, Cint, (Ptr{GObject}, Ref{Function}))
+    cfunc = @cfunction(GtkCustomFilterFunc, Cint, (Ptr{GObject}, Ref{Function}))
     ref, deref = GLib.gc_ref_closure(match)
     ccall(("gtk_custom_filter_set_filter_func", libgtk4), Nothing, (Ptr{GObject}, Ptr{Nothing}, Ptr{Nothing}, Ptr{Nothing}), cf, cfunc, ref, deref)
     return nothing
diff --git a/test/action-group.jl b/test/action-group.jl
index 9808aba6..956a4254 100644
--- a/test/action-group.jl
+++ b/test/action-group.jl
@@ -61,11 +61,33 @@ end
 
 delete!(g, "do-something")
 
+# test the more sophisticated `signal_connect`
 signal_connect(on_action_added2, g, "action_added", Nothing, (String,), false, 3)
 
-push!(g,a)
+# test `add_action`
+function cb(a,v)
+    nothing
+end
+
+add_action(GActionMap(g), "new-action", cb)
+
 @test extra_arg_ref[] == 3
 
+function cb2(a,v,user_data)
+    nothing
+end
+
+add_action(GActionMap(g), "new-action2", cb2, 4)
+
+# test `add_stateful_action`
+
+a5 = add_stateful_action(GActionMap(g), "new-action3", true, cb)
+add_stateful_action(GActionMap(g), "new-action4", true, cb2, 5)
+
+@test a5.state == GVariant(true)
+GLib.set_state(a5, GVariant(false))
+@test a5.state == GVariant(false)
+
 # test keyword constructor
 
 a2 = GSimpleAction("do-something-else";enabled=false)
diff --git a/test/gui/examples.jl b/test/gui/examples.jl
index a05e3859..c6cd197d 100644
--- a/test/gui/examples.jl
+++ b/test/gui/examples.jl
@@ -38,6 +38,7 @@ end
 
 @testset "Filtered List View" begin
     include(joinpath(@__DIR__, "..", "..", "examples", "filteredlistview.jl"))
+    @test Gtk4.G_.match(filter,Gtk4.GLib.G_.get_item(GListModel(model),0))
     destroy(win)
 end
 
diff --git a/test/gui/listviews.jl b/test/gui/listviews.jl
index e500a993..b2d2602f 100644
--- a/test/gui/listviews.jl
+++ b/test/gui/listviews.jl
@@ -30,7 +30,8 @@ function bind_cb(f, li)
 end
 
 
-list = GtkListView(GtkSelectionModel(GtkSingleSelection(model)), factory)
+list = GtkListView(GtkSelectionModel(GtkSingleSelection(model)))
+Gtk4.factory(list,factory)
 
 signal_connect(setup_cb, factory, "setup")
 signal_connect(bind_cb, factory, "bind")
@@ -48,7 +49,7 @@ destroy(win)
 
 end
 
-@testset "Listbox" begin
+@testset "ListBox" begin
 win = GtkWindow("ListBox demo with filter")
 box = GtkBox(:v)
 entry = GtkSearchEntry()
@@ -93,3 +94,35 @@ destroy(win)
 
 end
 
+@testset "FlowBox" begin
+win = GtkWindow("FlowBox demo with filter")
+box = GtkBox(:v)
+entry = GtkSearchEntry()
+sw = GtkScrolledWindow()
+push!(box, entry)
+push!(box, sw)
+push!(win, box)
+
+listBox = GtkFlowBox()
+l=GtkLabel("widget 1")
+push!(listBox, l)
+@test listBox[1].child == l
+l0=GtkLabel("widget 0")
+pushfirst!(listBox, l0)
+@test listBox[1].child == l0
+lmiddle=GtkLabel("widget 0.5")
+insert!(listBox,2,lmiddle)
+@test listBox[2].child == lmiddle
+
+delete!(listBox, listBox[1])
+@test listBox[2].child == l
+
+listBox[1] = GtkLabel("widget 2")
+@test listBox[2].child != l
+sw[] = listBox
+listBox.vexpand = true
+
+destroy(win)
+
+end
+
diff --git a/test/gui/misc.jl b/test/gui/misc.jl
index baf6684d..7e087cd4 100644
--- a/test/gui/misc.jl
+++ b/test/gui/misc.jl
@@ -95,6 +95,8 @@ for child in g1
     i += 1
 end
 
+@test length(Gtk4.toplevels()) == 1
+
 destroy(w)
 end
 
diff --git a/test/gui/window.jl b/test/gui/window.jl
index f81a8772..9358a451 100644
--- a/test/gui/window.jl
+++ b/test/gui/window.jl
@@ -28,12 +28,11 @@ if m!==nothing
     r = Gtk4.G_.get_geometry(m)
 end
 
-#r2 = m.geometry
-
 hide(w)
 show(w)
 grab_focus(w)
 close(w)
+sleep(0.2)
 destroy(w)
 
 end