When an element is hidden, it will not be drawn, but still take up space in the layout.
Use Collapse if you don't want the element to take up any space.
Basic syntax
<HideTargetNode="myElement"/>
Example
<ButtonText="Hide the element"><Clicked><HideTargetNode="visibleElement"/></Clicked></Button><Panelux:Name="visibleElement"Visibility="Visible"Background="Blue"/>
The node that the action targets. If not specified then the enclsoing Trigger will be used.
Several triggers can look for a target starting from this point. Some triggers require
a Target to be specified.