How can I know the mouse click a tabformcontrol1 object on the blank area (right)

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DevExpress

hello..friends...

how can i get the mouse click a tabFormControl1 object
..Double click on the blank area
thankyou
i need your help
any help is welcome Thanks very much...
PS. excuse my English...i only know a little English....

this.tabFormControl1.MouseDown += F_MouseDown;
//here the click... it can click the pagetab..
//i don't  want it click the tabtitle

if (e.X == 8 && e.Y == 9)
            {
                //click the tabtitle right : on the blank area
                //i can do something
                // such as  i can change the form :
                this.WindowState = FormWindowState.Maximized;
            }
            else
            {
                //is click the tab title... ...can do something
            }

how can i know the mouse click a tabFormControl1 object on the blank area (right)

What I have tried:

search no result...and try it