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