I have this problem in a bigger Project...... so I set up a 'Testpoject' as Proof of Concept:

• New Silverlight-Application
• Add Listbox
• Fill listbox with a few Checkboxes
• Register listBox1_MouseLeftButtonDown
• register listBox1_MouseRightButtonDown

You will see, that the listBox1_MouseLeftButtonDown won't fire under any circumstances.... listBox1_MouseRightButtonDown however fires just fine.

I tried using a custom Class deriving from ListBox and overriding, assuming something in the ListBox Class was setting e.Handled = false, but this did not change the behaviour, either.

Any Ideas on why this happens and how to fix?

(This problem also stops the 'parent'-control from receiving the Click-Event... so the Event-passing is broke)