diff --git a/ButtonDropdown.php b/ButtonDropdown.php
index 3f2a236..310b4a0 100644
--- a/ButtonDropdown.php
+++ b/ButtonDropdown.php
@@ -8,6 +8,7 @@
 namespace yii\bootstrap;
 
 use yii\helpers\ArrayHelper;
+use yii\helpers\Url;
 
 /**
  * ButtonDropdown renders a group or split button dropdown bootstrap component.
@@ -104,11 +105,12 @@ class ButtonDropdown extends Widget
         if ($this->encodeLabel) {
             $label = Html::encode($label);
         }
+
         if ($this->split) {
             $options = $this->options;
             $this->options['data-toggle'] = 'dropdown';
             Html::addCssClass($this->options, ['toggle' => 'dropdown-toggle']);
-            unset($this->options['id']);
+            unset($options['id']);
             $splitButton = Button::widget([
                 'label' => '<span class="caret"></span>',
                 'encodeLabel' => false,
@@ -118,14 +120,21 @@ class ButtonDropdown extends Widget
         } else {
             $label .= ' <span class="caret"></span>';
             $options = $this->options;
-            if (!isset($options['href']) && $this->tagName === 'a') {
-                $options['href'] = '#';
-            }
             Html::addCssClass($options, ['toggle' => 'dropdown-toggle']);
             $options['data-toggle'] = 'dropdown';
             $splitButton = '';
         }
 
+        if (isset($options['href'])) {
+            if (is_array($options['href'])) {
+                $options['href'] = Url::to($options['href']);
+            }
+        } else {
+            if ($this->tagName === 'a') {
+                $options['href'] = '#';
+            }
+        }
+
         return Button::widget([
             'tagName' => $this->tagName,
             'label' => $label,
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9324d4c..28013cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Yii Framework 2 bootstrap extension Change Log
 2.0.8 under development
 -----------------------
 
+- Bug #126: Fixed `yii\bootstrap\ToggleButtonGroup` toggles dropdown for both buttons in case `split` is enabled (klimov-paul)
 - Enh #219: Add ability to use custom HTML in navbar-header (razvanphp)
 - Enh #171: Add ability to use a brandImage with the navbar (razvanphp)