diff --git a/application/ui.extkeywidget.class.inc.php b/application/ui.extkeywidget.class.inc.php
index 78e45746da..a6e7b8195e 100644
--- a/application/ui.extkeywidget.class.inc.php
+++ b/application/ui.extkeywidget.class.inc.php
@@ -1000,8 +1000,8 @@ JS
 			$oPage->add('<div class="treecontrol" id="treecontrolid"><a href="?#">'.Dict::S("UI:Treeview:CollapseAll").'</a> | <a href="?#">'.Dict::S("UI:Treeview:ExpandAll").'</a></div>');
 		}
 
-		$oPage->add("<input type=\"button\" id=\"btn_cancel_{$this->iId}\" value=\"".Dict::S('UI:Button:Cancel')."\" onClick=\"$('#dlg_tree_{$this->iId}').dialog('close');\">&nbsp;&nbsp;");
-		$oPage->add("<input type=\"button\" id=\"btn_ok_{$this->iId}\" value=\"".Dict::S('UI:Button:Ok')."\"  onClick=\"oACWidget_{$this->iId}.DoHKOk();\">");
+		$oPage->add("<input type=\"button\" class=\"ibo-button ibo-is-regular ibo-is-neutral\" id=\"btn_cancel_{$this->iId}\" value=\"".Dict::S('UI:Button:Cancel')."\" onClick=\"$('#dlg_tree_{$this->iId}').dialog('close');\">&nbsp;&nbsp;");
+		$oPage->add("<input type=\"button\" class=\"ibo-button ibo-is-regular ibo-is-primary\" id=\"btn_ok_{$this->iId}\" value=\"".Dict::S('UI:Button:Ok')."\"  onClick=\"oACWidget_{$this->iId}.DoHKOk();\">");
 
 		$oPage->add('</div></div>');