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MQL5 ReferenceStandard LibraryPanels and DialogsCWndClientVScrolled 

VScrolled (Get method)

Gets the flag indicating that vertical scroll bar is used.

bool  VScrolled()

Return Value

true - vertical scroll bar is used, otherwise - false.

VScrolled (Set method)

Sets the flag indicating that vertical scroll bar is used.

bool  VScrolled(
   const bool  flag      // flag
   )

Parameters

flag

[in]  Flag.

Return Value

true - successful, otherwise - false.