Mouse events not called in VB WPF, does z-order matter?

Question

There are many explanation in google, but I still struggling to implement mouse events.

• I have tried to use MouseEnter=\"Canvas1_MouseEnter\" in canva

Answer 1

Your canvas does not have the MouseEnter event. Use it like this

<Grid>
    <Canvas HorizontalAlignment="Left" Height="158" Margin="191,85,0,0" VerticalAlignment="Top" 
            Width="221" Background="#FF575757" MouseEnter="Canvas_MouseEnter"/>
</Grid>

And then the Sub for the Event:

Private Sub Canvas_MouseEnter(sender As Object, e As MouseEventArgs)
    MessageBox.Show("Hello?")
End Sub

Answer 2

UI elements in WPF do not receive mouse events (without mouse capture) outside their rendered area. A Panel (like your Canvas) does not render anything outside the area of its child elements unless you define a non-null value for its Background property.

You may set a Background for your Canvas like shown below, which makes it render the entire area defined by its ActualWidth and ActualHeight with a transparent brush:

<Canvas x:Name="Canvas1" Background="Transparent"
        MouseEnter="Canvas1_MouseEnter" ... />