how can we change zindex of a silverlight control programmatically?

I have some controls added in a stackpanel programmatically. What i want to do is that i want one of the controls in this stackpanel to be placed over another control. Specifically, I want to place button over an image in this stack panel. I couldn't find zindex property in c# code开发者_开发百科behind. Although it seems very simple problem but i am unable to find any clue to solve this problem. Anyone please......??

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Try placing all your controls on Canvas. Then you can set Zindex with:

this.controlName.SetValue(Canvas.ZIndexProperty, 10d);

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Only the Canvas panel supports a ZIndex property. Stackpanel doesn't because each item is placed one after the other in the panel so they shouldn't overlap each other. This can be a little annoying at times when you have animated transforms moving the items about because the previous assumption isn't actually true.

In general though if you need to place items in a visual stack the Stackpanel isn't the right place for it. Perhaps a Canvas or you could use a Grid where the oridinal position of a element determines its "zorder" in a cell.

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From xaml:

<StackPanel Canvas.ZIndex="1">
</StackPanel>