ASP.NET Splitter - Collapsed panel after postback

Click on the arrow of the splitter separator.
The left panel of the splitter will collapse.
Postback using the "Postback" button. The left panel will remain collapsed.
Click again to expand the left panel back.





The feature also works in horizontal splitter.

Example code

    <obspl:Splitter CollapsePanel="left" id="spl1" runat="server" StyleFolder="styles/default">
        <LeftPanel>
            <Content>
                ... Left Panel content here ...
    ...

VB.NET
spl1.CollapsePanel = VerticalCollapsePanelType.left


C#
spl1.CollapsePanel = VerticalCollapsePanelType.right;


JavaScript
spl1.CollapsePanel("left");
spl1.ExpandPanel("right");

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