Fixes several issues (#1379 and #1381) in xceedsoftware/wpftoolkit#1393

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nonsensesoftware wants to merge 3 commits intoxceedsoftware:masterfrom nonsensesoftware:master

+12-7

Commits on Oct 9, 2018

Fixes issue xceedsoftware#1379 in xceedsoftware/wpftoolkit
nonsensesoftware
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Commits on Oct 15, 2018

Fixes NullReferenceException in xceedsoftware#1354
nonsensesoftware
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Commits on Oct 17, 2018

Prevent crash from setting negative size
nonsensesoftware
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