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Close ToolStripDropdown Object When Parent Container Or Form Is Clicked In C# Windows Forms

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To close the ToolStripDropdown object which is part of the textbox custom control, add event handler signatures and event definition using the code below: 
//add statements in the custom control constructor  
  this.Parent.Click += new EventHandler(Parent_Click);  
  this.Parent.Move += new EventHandler(Parent_Click);  

 //event body  
  private void Parent_Click(object sender, EventArgs e)  
 {  
      _dropDown.Close(); //ToolStripDropdown object  
  }
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