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Returns the height of the header in a LIST or COMBO control. The height is measured in dialog units (unless PROP:Pixels is active). (READ-ONLY)

**Example:**

**MDIChild WINDOW('Child One'),AT(0,0,320,200),MDI,MAX,HVSCROLL**

**      LIST,AT(0,0,220,220),USE(?L1),FROM(Que),IMM,FORMAT('60L~Header Text~')**

**     END**

** CODE**

** OPEN(MDIChild)**

** X# = ?L1{PROP:HeaderHeight}     !Get height of header in dialog units**