title: DataGridView rows can't change their background color at the initialization stage
body: <p>I have the next problem:
   TabControl has three TabPages. Every TabPage has its own DataGridView. On "Enter" event some rows change their background color.
   When the form begin to initialize, the function, that changes color, is called. But DataGridView rows have their default background (background color hasn't been changed). If I click on another TabPage and then come back to the first TabPage the function is called again and the background is changed. So, why it doesn't happen at first time on the initialization stage (the function is called, but the rows don't change their color). How can I force the DataGridView to change the background color of its rows at the initialization stage?
  Thanks a lot!</p>