What is the worst gotcha in WPF?

Posted by David on Stack Overflow See other posts from Stack Overflow or by David
Published on 2011-02-10T13:26:14Z Indexed on 2011/02/11 23:25 UTC
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tips-and-tricks

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gotchas

Hi,

I've started to make myself a list of "WPF gotchas": things that bug me and that I had to write down to remember because I fall for them every time....

Now, I'm pretty sure you all stumbled upon similar situations at one point, and I would like you to share your experience on the subject:

What is the gotcha that gets you all the time? the one you find the most annoying?

(I have a few issues that seem to be without explanation, maybe your submissions will explain them)

Here are a few of my "personnal" gotchas (randomly presented):

For a MouseEvent to be fired even when the click is on the "transparent" background of a control (e.g. a label) and not just on the content (the Text in this case), the control's Background has to be set to "Brushes.Transparent" and not just "null" (default value for a label)
A WPF DataGridCell's DataContext is the RowView to whom the cell belong, not the CellView
When inside a ScrollViewer, a Scrollbar is managed by the scrollviewer itself (i.e. setting properties such as ScrollBar.Value is without effect)
Key.F10 is not fired when you press "F10", instead you get Key.System and you have to go look for e.SystemKey to get the Key.F10

... and now you're on.

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