Extending a windows control

[Dom]

Sometimes I try to extend a windows control just to give it added
functionality. For example, the DataGridView control does not have a
"IntegralHeight" property, like a list box, so I create a

class MyDataGridView : DataGridView
{
}

.... to add this functionality. I ALWAYS get an error message that
says "MyDataGridView does not contain a definition for
"AutoScaleMode", and when I click on the error, I get a like in the
Designer.cs that I never requested. My habit is to just remove it.

1. Why is it there?
2. Am I right to just remove it?

Dom