private void toolStripMenuItemFindPage_Click(object sender, EventArgs e)
{
this.toolStripMenuItemFindItem.Checked = false;
this.toolStripMenuItemFindText.Checked = false;
this.toolStripMenuItemFindPage.Checked = true;
this.toolStripDropDownButtonFind.Image = this.toolStripMenuItemFindPage.Image;
}