diff --git a/InputfieldMapMarker.js b/InputfieldMapMarker.js
index a717b26..f6c477d 100644
--- a/InputfieldMapMarker.js
+++ b/InputfieldMapMarker.js
@@ -99,6 +99,23 @@ var InputfieldMapMarker = {
 			}
 			return true;
 		});
+
+		// added by diogo to solve the problem of maps not rendering correctly in hidden elements
+		// trigger a resize on the map when either the tab button or the toggle field bar are pressed
+		$(document).ready(function() {
+			
+			// get the tab element where this map is integrated
+			$tab = $('#_' + $(map.b).closest('.InputfieldFieldsetTabOpen').attr('id'));
+			// get the inputfield where this map is integrated and add the tab to the stack
+			$inputFields = $(map.b).closest('.Inputfield').find('.InputfieldStateToggle').add($tab);
+
+			$inputFields.on('click',function(){
+				// give it time to open
+				window.setTimeout(function(){
+					google.maps.event.trigger(map,'resize');
+				}, 200);
+			});
+		});
 		
 	}
 };