Drawing outside of an event handler wx.EVT_PAINT

I need to draw a grid in the cells of which images will be located 
(wx.Bitmap).

When you click on a cell, the cursor (orange square) should draw above it.

Since the wx.EVT_PAINT handler will need to draw quite a lot, it was 
decided to draw the cursor using wx.ClientDC, when the user selects a cell, 
and through wx.PaintDC, when the full redraw is called (self.DrawCursor(dc) 
in OnPaint).

My problem is that when I draw a new cursor, the old one is not removed 
until the wx.EVT_PAINT handler is called.

Using self.SetDoubleBuffered (True) solves my problem, but it results in 
the wx.EVT_PAINT handler being called every time the cell is clicked, which 
leads to a large extra computational cost, since I only need to redraw the 
cursor (and the function draw cursor is called twice).

If I draw only through wx.ClientDC (that is, self.DrawCursor(None) in 
OnPaint), then I get overlapping cursors when scrolling the window, and the 
old cursor is not deleted when completely redrawn.

Can you please tell me if there is a correct solution to my problem?

Code: https://ideone.com/6jKSnV

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