docs: function setArrowFromButton(obj) {
  		
  		var parts = this.id.split('_');
  		var pos = parts[1];
  		var val = parts[2];
  		if (parts[3]) { val += '_' + parts[3];}
  		
  		if (val != 'textmarker') {
  			triggerTextEntry(pos, '\\'+val);
  		} else {
  			showTextPrompt(pos);
  		}
  	}