DataGrid Object Error

In using the Datagrid I generated a datagrid of 8 columns and 300 rows. If I use "just" the drag handle on the vertical scrollbar I can move up and down the grid with no problem. But if I click on the up arrow or down arrow of the scrollbar it will mess up. For example, if the click the down arrow it will scroll down but not allow me to select the drag handle or the up arrow and somewhat hangs up the application.

This appears to the an error with the control. Could this be fixed?

Update: I have found that if after clicking the uparrow or the downarrow if I click outside the datagrid and cause it to lose focus then I can then select the draghandle. However, I am also getting a problem with the zero row not displaying correctly.

This may be related to the graphic card???? Anyway a couple of the column heading go blank.

OK, I have repeatable error.
Repeatable error.

Create the datagrid with 300 rows and 8 columns. Then use the draghandle to move up and down. Everything is fine. Now click the up arrow and each time you move the cursor over the up arrow the grid scrolls up but will not allow you to select the draghandle or the down arrow. Move outside the grid and click to force the datagrid to lose focus. Now click the draghandle and the column headings disappear as the grid appears to be changing into a different scrolling mode. This is a repeatable error.

I have also tested with the hortizonal scrollbar and found the same problems.

There appear to be a number of other problems with the Datagrid.

I have one that I set up. But if I go to the properties and check "column resize" and "editable" when I run the application it does not change and allow the columns to resize or the datagrid to be editable.

I also found that with the draging problem listed above the besides the titles for certain columns and rows disappearing the border line also partly disappears.