A small problem please help..

See more:

C#

.NET

Visual-Studio

hello friends ,
I making a window form in which i have two button close to each other on first button i work on its Enter and Leave event for increase its size and dec its size..like this

private void button1_MouseEnter(object sender, EventArgs e)
      {
          button1.Height += 91;
          button1.Width += 94;
          button1.Image = Image.FromFile("C:\\Documents and Settings\\Administrator\\My Documents\\Downloads\\bUTTON.jpg");
          button1.Top -= 45;
          button1.Left -= 47;
      }
      private void button1_MouseLeave(object sender, EventArgs e)
      {
          button1.Height -= 91;
          button1.Width -= 94;
          button1.Image = Image.FromFile("C:\\Documents and Settings\\Administrator\\My Documents\\Downloads\\BB.jpg");
          button1.Top += 45;
          button1.Left += 47;

the problem is that when size get increase the small part of first button goes under button second..so pls help how i remove this problem that whenever i use thus event on button the get in front..
any help is welcome and appreciated..