subwidgets should be rendered in the same view

ButtonDropdown.php

@@ -87,6 +87,7 @@ class ButtonDropdown extends Widget
 				'label' => '<span class="caret"></span>',
 				'encodeLabel' => false,
 				'options' => $this->options,
+				'view' => $this->getView(),
 			]);
 		} else {
 			$label .= ' <span class="caret"></span>';
@@ -103,6 +104,7 @@ class ButtonDropdown extends Widget
 			'label' => $label,
 			'options' => $options,
 			'encodeLabel' => false,
+			'view' => $this->getView(),
 		]) . "\n" . $splitButton;
 	}
 
@@ -114,6 +116,7 @@ class ButtonDropdown extends Widget
 	{
 		$config = $this->dropdown;
 		$config['clientOptions'] = false;
+		$config['view'] = $this->getView();
 		return Dropdown::widget($config);
 	}
 }

ButtonGroup.php

@@ -86,7 +86,8 @@ class ButtonGroup extends Widget
 				$buttons[] = Button::widget([
 					'label' => $label,
 					'options' => $options,
-					'encodeLabel' => $this->encodeLabels
+					'encodeLabel' => $this->encodeLabels,
+					'view' => $this->getView()
 				]);
 			} else {
 				$buttons[] = $button;

Nav.php

@@ -171,6 +171,7 @@ class Nav extends Widget
 					'items' => $items,
 					'encodeLabels' => $this->encodeLabels,
 					'clientOptions' => false,
+					'view' => $this->getView(),
 				]);
 			}
 		}

Tabs.php

@@ -134,7 +134,7 @@ class Tabs extends Widget
 				}
 
 				$header = Html::a($label, "#", ['class' => 'dropdown-toggle', 'data-toggle' => 'dropdown']) . "\n"
-					. Dropdown::widget(['items' => $item['items'], 'clientOptions' => false]);
+					. Dropdown::widget(['items' => $item['items'], 'clientOptions' => false, 'view' => $this->getView()]);
 			} elseif (isset($item['content'])) {
 				$options = array_merge($this->itemOptions, ArrayHelper::getValue($item, 'options', []));
 				$options['id'] = ArrayHelper::getValue($options, 'id', $this->options['id'] . '-tab' . $n);