public void buildGui()
 {
 	var controls = this.add_1x1("Text to convert","converted links",true,200);
 	textBox = controls[0].add_RichTextBox();
 	webBrowser = controls[1].add_WebBrowser();        	
 	// events
 	textBox.onDrop(convertFile);
 	textBox.TextChanged += (sender,e) => convertText(textBox.Text);
 }