You can perform expand and collapse in WebExplorerPane. Simply click on the Up/Down
                arrow at the right most part of ExplorerPane header to Expand and Collapse the ExplorerPane.
            
                In this topic, you will learn how to enable expand/collapse from client-side.
            
                To enable expand/collapse
            
                - Drag a HTML button control to the WebForm.
 
                - Create ExpandPane() function to implement expand and collapse pane.
                    
                        
                            
                                
                                
                            
                            
                                
                                    
function ExpandPane(paneId, buttonId) 
{
   var expPane = ISGetObject("WebExplorerPane1");
   var button = ISGetObject(buttonId);
   var pane = expPane.Panes.GetNamedItem(paneId);
   if (pane.Collapse) 
   {
      pane.DoExpand();     
   }
   else 
   {
      pane.DoCollapse();
   }
}
                        
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                - Trigger ExpandPane() using onclick on HTML
                    button.
                    
                    <input ID="Button1" type="button" value="button" onclick="ExpandPane('barPictureTasks',
                        'Button1')"/>
                    
                 
                - Run the project.