I have not tried this but if you put CloseCommanArea( ) code on Form Entry and On Form Exit Events of various forms, it might work to close the command tree.

var vState as Int

vState = @CloseCommandArea ( )
If vState = 0
    {
           CloseCommandArea (1)
    }

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In order for SelectCommandTreeItem ( ) commands to work, command tree need not be open or visible. Please let us know if this or any modification of this works for you.