Hope this might help:
I have the following tree in a scrollpane and it works fine, the background
has the
same width of the left pane.
This is as extract of my bxml file:
<SplitPane orientation="horizontal" splitRatio="0.25">
<left>
<Border styles="{color:6, backgroundColor:11, padding: 4,cornerRadii:
5}">
<ScrollPane bxml:id="groupScrollPane"
horizontalScrollBarPolicy="fill_to_capacity" styles="{backgroundColor:11}">
<TreeView bxml:id="groupTreeView" styles="{backgroundColor:11}">
</TreeView>
</ScrollPane>
</Border>
</left>
<right>
</right>
</SplitPane>
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