Returns \true if the picker control is growable.
-\membersection{wxPickerBase::SetPickerCtrlGrowable}\label{wxpickerbasesetpickerctrlgrowable}
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-\func{void}{SetPickerCtrlGrowable}{\param{bool}{ grow = true}}
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-Sets the picker control as growable when {\tt grow} is \true.
-This function has effects only when \helpref{HasTextCtrl}{wxpickerbasehastextctrl} returns \true.
-