[QUESTION] How to change color of the buttons in Insert menus (image, url, etc)?

[irfanlal]

When I open one of the insert menus (image, url, etc), I don't see Cancel and OK buttons since presumably they have the same color as the menu.

However, I know they are located there because when I don't upload anything but tap the area around the bottom right corner, I get this warning "Please either choose an image or enter an Image URL!".

Tapping the area slightly to the left of the invisible OK button, closes the insert menu.
I tried setting color properties in the HtmlToolbarOptions but they all seem to work with buttons and not insert menus. Thanks in advance