diff --git a/css/Makefile b/css/Makefile
index 36e62ff..5054b55 100644
--- a/css/Makefile
+++ b/css/Makefile
@@ -1,6 +1,6 @@
 include ../defines.mk
 
-CSS=
+CSS=ext6-pmx.css
 
 all:
 
diff --git a/css/ext6-pmx.css b/css/ext6-pmx.css
new file mode 100644
index 0000000..898c5bc
--- /dev/null
+++ b/css/ext6-pmx.css
@@ -0,0 +1,3 @@
+.pmx-clear-trigger {
+    background-image: url(../images/pmx-clear-trigger.png);
+}
diff --git a/form/ComboGrid.js b/form/ComboGrid.js
index 608f613..aaaa107 100644
--- a/form/ComboGrid.js
+++ b/form/ComboGrid.js
@@ -38,6 +38,24 @@ Ext.define('Proxmox.form.ComboGrid', {
 
     editable: false,
 
+    triggers: {
+	clear: {
+	    cls: 'pmx-clear-trigger',
+	    weight: -1,
+	    hidden: true,
+	    handler: function() {
+		var me = this;
+		me.setValue('');
+	    }
+	}
+    },
+
+    setValue: function(value) {
+	var me = this;
+	me.triggers.clear.setVisible(!!value && me.allowBlank);
+	return me.callParent([value]);
+    },
+
     // override ExtJS method
     // if the field has multiSelect enabled, the store is not loaded, and
     // the displayfield == valuefield, it saves the rawvalue as an array
diff --git a/images/Makefile b/images/Makefile
index 002ad27..45bc50a 100644
--- a/images/Makefile
+++ b/images/Makefile
@@ -1,6 +1,6 @@
 include ../defines.mk
 
-IMAGES=
+IMAGES=pmx-clear-trigger.png
 
 all:
 
diff --git a/images/pmx-clear-trigger.png b/images/pmx-clear-trigger.png
new file mode 100644
index 0000000..cc374cf
Binary files /dev/null and b/images/pmx-clear-trigger.png differ