The ExG2antt ActiveX Control can group the columns into two categories: locked and unlocked. The Locked category contains all the columns that are fixed to the left area of the client area. These columns cannot be scrolled horizontally. Use the CountLockedColumns to specify the number of locked columns. The unlocked are contains the columns that can be scrolled horizontally. Use the BackColorLock property to change the control's background color for the locked area. Use the LockedItemCount property to add or remove items locked ( fixed ) to the top or bottom side of the control.