diff --git a/indra/llui/lltabcontainer.cpp b/indra/llui/lltabcontainer.cpp
index 1dcfb4e296..30fc7babae 100644
--- a/indra/llui/lltabcontainer.cpp
+++ b/indra/llui/lltabcontainer.cpp
@@ -2061,12 +2061,5 @@ void LLTabContainer::commitHoveredButton(S32 x, S32 y)
 				tuple->mButton->onCommit();
 			}
 		}
-		/**
-		 * EXT - 4572 (Click and hold the left mouse button doesn't let you browse tabbed IM floater)
-		 *
-		 * During hovering mouse(with left mouse button hold) over tabs, a newly just activated corresponding
-		 * to the tab(that is hovered in the given instant of time) panel may caught mouse capture.
-		 */
-		gFocusMgr.setMouseCapture(this);
 	}
 }
diff --git a/indra/newview/llimfloater.cpp b/indra/newview/llimfloater.cpp
index 8cdc50eb70..77eaebb0bc 100644
--- a/indra/newview/llimfloater.cpp
+++ b/indra/newview/llimfloater.cpp
@@ -127,12 +127,6 @@ void LLIMFloater::onFocusReceived()
 {
 	LLIMModel::getInstance()->setActiveSessionID(mSessionID);
 
-	// return focus to the input field when active tab in the multitab container is clicked.
-	if (isChatMultiTab() && mInputEditor)
-	{
-		mInputEditor->setFocus(TRUE);
-	}
-
 	LLBottomTray::getInstance()->getChicletPanel()->setChicletToggleState(mSessionID, true);
 }
 
@@ -682,15 +676,6 @@ void LLIMFloater::onInputEditorFocusReceived( LLFocusableElement* caller, void*
 		//in disconnected state IM input editor should be disabled
 		self->mInputEditor->setEnabled(!gDisconnected);
 	}
-
-	// when IM Floater is a part of the multitab container LLTabContainer set focus to the first
-	// child on tab button's mouse up. This leads input field lost focus. See EXT-3852.
-	if (isChatMultiTab())
-	{
-		// So, clear control captured mouse to prevent LLTabContainer set focus on the panel's first child.
-		// do not pass self->mInputEditor, this leads to have "Edit Text" mouse pointer wherever it is.
-		gFocusMgr.setMouseCapture(NULL);
-	}
 }
 
 // static
diff --git a/indra/newview/skins/default/xui/en/floater_im_session.xml b/indra/newview/skins/default/xui/en/floater_im_session.xml
index d2e5473157..25016e0673 100644
--- a/indra/newview/skins/default/xui/en/floater_im_session.xml
+++ b/indra/newview/skins/default/xui/en/floater_im_session.xml
@@ -2,6 +2,7 @@
 <floater
  legacy_header_height="18"
  background_visible="true"
+ default_tab_group="1"
  follows="all"
  height="350"
  layout="topleft"
@@ -18,12 +19,14 @@
  min_height="190">
   <layout_stack
    animate="false" 
+   default_tab_group="2"
   follows="all"
   height="320"
   width="360"
   layout="topleft"
   orientation="horizontal"
   name="im_panels"
+  tab_group="1"
   top="20"
   left="0">
     <layout_panel
@@ -35,7 +38,9 @@
       auto_resize="false"
       user_resize="true" />
     <layout_panel
+       default_tab_group="3"
        left="0"
+       tab_group="2"
        top="0"
        height="200"
 	     width="245"
@@ -75,6 +80,7 @@
          label="To"
          layout="bottomleft"
          name="chat_editor"
+         tab_group="3"
          width="240">
         </line_editor>
     </layout_panel>