private void AddVariableWindow_FormClosing(object sender, FormClosingEventArgs e) { // See if if the user is trying to create a reserved variable if (this.DialogResult == System.Windows.Forms.DialogResult.OK && radCreateNewEvent.Checked && EditorLogic.CurrentEntitySave != null && ExposedVariableManager.IsMemberDefinedByPositionedObject(this.textBox1.Text) ) { System.Windows.Forms.MessageBox.Show("The variable " + this.textBox1.Text + " is " + "already defined by the engine. You can expose this variable or select a different name."); e.Cancel = true; } }