Change the stacking order
Expression Studio 4.0
To change the stacking order of an object in a StackPanel
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Click a StackPanel object in your Microsoft Expression Blend document, to make the panel the active object.
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In the StackPanel object, click a child object to select it.
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On the artboard or in the Objects and Timeline panel, drag the child object into the desired position in the order. Notice that as you drag the object on the artboard, a blue line shows where you can insert the object.