Q:
How to enable the collapsing button? Can I customize it?
A:
You can enable the collapsing button by simply setting the CollpasePanel property.
Accepted values are:
·VerticalCollapsePanelType.none, VerticalCollapsePanelType.left,
VerticalCollapsePanelType.right for Vertical Splitter.
·HorizontalCollapsePanelType.none, HorizontalCollapsePanelType.top,
HorizontalCollapsePanelType.bottom for Horizontal Splitter.
Default value is:
·VerticalCollapsePanelType.none for Vertical Splitter.
·HorizontalCollapsePanelType.none for 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
spl1.CollapsePanel = VerticalCollapsePanelType.right
C#
spl1.CollapsePanel = VerticalCollapsePanelType.left;
See also collapse panel example.
You can also check how to customize the collapsing button.