wxMin( (int)( GetLineAt( wxMax(0,update.y+update.height) ) - item_start + 1),
(int)(GetRowCount( ) - item_start));
unsigned int item_last = item_start + item_count;
wxMin( (int)( GetLineAt( wxMax(0,update.y+update.height) ) - item_start + 1),
(int)(GetRowCount( ) - item_start));
unsigned int item_last = item_start + item_count;