Hi Ranjan,
Thanks for using Syncfuion product,
The sub items can be added to ToolStripEx by using the below
code snippet. We have also prepared a sample for your reference and this is
available in the below link.
Code Snippet[C#]:
// Declare and
initialize a ToolStripEx.
Syncfusion.Windows.Forms.Tools.ToolStripEx paraToolStrip = new Syncfusion.Windows.Forms.Tools.ToolStripEx();
// Add the items to
the ToolStripEx.
paraToolStrip.Items.Add(new ToolStripButton());
paraToolStrip.Items.Add(new ToolStripDropDownButton());
paraToolStrip.Items.Add(new ToolStripSplitButton());
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Link : http://www.syncfusion.com/downloads/support/directtrac/general/ToolStripEx_(2)481111481.zip
Please have the below documentation link to know more about ToolStripEx,
Link : http://help.syncfusion.com/ug/windows%20forms/default.htm#!documents/toolstripex.htm
Please let us know if you need further assistance,
Regards,
R.Senthil kumaran