Wpf datatrigger binding not updating

In the previous article we saw how changes in a Text Box was not immediately sent back to the source.

Instead, the source was updated only after focus was lost on the Text Box.

The other options are Property Changed, Lost Focus and Explicit.

The first two has already been described, while the last one simply means that the update has to be pushed manually through to occur, using a call to Update Source on the Binding.

We then add a trigger, which listens to the Is Mouse Over property - once this property changes to True, we apply two setters: We change the Foreground to red and then we make it underlined.

This is a great example on how easy it is to use triggers to apply design changes, completely without any code-behind code.

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So far, we worked with styles by setting a static value for a specific property.

In above example even if Property A becomes true then text of the textblock will remain "Default Value" instead of "Updated Value".

Fix: In order to work it properly, you need to specify the "Default Value" in style not with the control.