Bug in Grid

When I receive an object json, result of a consulting Oracle, in which, some fields come with the value null, the grid puts values of the previous record in those fields nulls, which they should appear empty.

Again when I receive an object json, result of a consulting, and I want to select the first line of the grid, the same is unavailable, assuming an obligation to click in another line and oh yes it is available the same.

Would you have some please example of putting an image (only the image) in the grid in agreement with the value of a column?

I am using the grid ActiveWidgets 2.5.3 Free Trial.

Thanks.