string grid canvas wider than columns?

[BlueGhost79]

hi,
I set my columns to equal the width of the string grid, yet when I click on the right side of the grid, it seems to scroll or jump over, obscuring the left most columns and displaying canvas that does not have columns. there are no scroll bars either to indicate that there would be more canvas to the right. why does it do this and how do I disable it?

my setup code is:

Pairings_grid->ColWidths[0] = (Pairings_grid->Width / 5);
		Pairings_grid->ColWidths[1] = (Pairings_grid->Width / 5);
		Pairings_grid->ColWidths[2] = (Pairings_grid->Width / 5);
		Pairings_grid->ColWidths[3] = (Pairings_grid->Width / 5);
		Pairings_grid->ColWidths[4] = (Pairings_grid->Width / 5);