* fix border-radius error of vertical button group.

src/less/controls/buttons.vertical.less

 /// ========================================================================
 /// Bootstrap: buttons.vertical.less
 /// https://github.com/twbs/bootstrap/blob/master/less/button-groups.less
-/// 
+///
 /// ZUI: The file has been changed in ZUI. It will not keep update with the
 /// Bootsrap version in the future.
 /// http://zui.sexy
@@ -14,7 +14,7 @@
 
 .btn-group-vertical {
   &:extend(.btn-group all);
-  
+
   > .btn,
   > .btn-group,
   > .btn-group > .btn {
@@ -45,7 +45,8 @@
   &:not(:first-child):not(:last-child) {
     border-radius: 0;
   }
-  &:first-child:not(:last-child) {
+  &:first-child:not(:last-child),
+  &:first-child:not(:last-child):not(.dropdown-toggle) {
     .border-top-radius(@btn-border-radius-base);
     .border-bottom-radius(0);
   }