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_flex.Invalidate();
_flex.Paint += new PaintEventHandler(draw_circle);
private void draw_circle(object sender, PaintEventArgs e)
{
//... ...
int x = _flex.ScrollPosition.X + _flex.Cols[c].Left + 5;
int y = _flex.ScrollPosition.Y + _flex.Rows[r].Top + 5;
// ... ...
}