msiContextSelectSubgraphs_Click
(
object sender,
EventArgs e
)
{
AssertValid();
// If a vertex was clicked, it is stored in the menu item's Tag.
Debug.Assert(sender is ToolStripMenuItem);
Object oTag = ( (ToolStripMenuItem)sender ).Tag;
Debug.Assert(oTag == null || oTag is IVertex);
SelectSubgraphs( (IVertex)oTag );
}