diff --git a/xbmc/guilib/GUIControlFactory.cpp b/xbmc/guilib/GUIControlFactory.cpp
index 5f00ad2669bfa..c1584da0982f4 100644
--- a/xbmc/guilib/GUIControlFactory.cpp
+++ b/xbmc/guilib/GUIControlFactory.cpp
@@ -174,18 +174,41 @@ bool CGUIControlFactory::GetFloatRange(const TiXmlNode* pRootNode, const char* s
   return true;
 }
 
-bool CGUIControlFactory::GetDimension(const TiXmlNode *pRootNode, const char* strTag, float &value, float &min)
+float CGUIControlFactory::ParsePosition(const char* pos, float parentSize)
+{
+  char* end;
+  float value = (float)strtod(pos, &end);
+  if (end)
+  {
+    if (*end == 'r')
+      value = parentSize - value;
+    else if (*end == '%')
+      value = value * parentSize / 100.0f;
+  }
+  return value;
+}
+
+bool CGUIControlFactory::GetPosition(const TiXmlElement *pControlNode, const char* strTag, float& value, float parentSize)
+{
+  const TiXmlElement* pNode = pControlNode->FirstChildElement(strTag);
+  if (!pNode || !pNode->FirstChild()) return false;
+
+  value = ParsePosition(pNode->FirstChild()->Value(), parentSize);
+  return true;
+}
+
+bool CGUIControlFactory::GetDimension(const TiXmlNode *pRootNode, const char* strTag, float &value, float &min, float parentSize)
 {
   const TiXmlElement* pNode = pRootNode->FirstChildElement(strTag);
   if (!pNode || !pNode->FirstChild()) return false;
   if (0 == strnicmp("auto", pNode->FirstChild()->Value(), 4))
   { // auto-width - at least min must be set
-    pNode->QueryFloatAttribute("max", &value);
-    pNode->QueryFloatAttribute("min", &min);
+    value = ParsePosition(pNode->Attribute("max"), parentSize);
+    min = ParsePosition(pNode->Attribute("min"), parentSize);
     if (!min) min = 1;
     return true;
   }
-  value = (float)atof(pNode->FirstChild()->Value());
+  value = ParsePosition(pNode->FirstChild()->Value(), parentSize);
   return true;
 }
 
@@ -691,19 +714,57 @@ CGUIControl* CGUIControlFactory::Create(int parentID, const CRect &rect, TiXmlEl
   // TODO: Perhaps we should check here whether id is valid for focusable controls
   // such as buttons etc.  For labels/fadelabels/images it does not matter
 
-  XMLUtils::GetFloat(pControlNode, "posx", posX);
-  XMLUtils::GetFloat(pControlNode, "posy", posY);
-  // Convert these from relative coords
-  CStdString pos;
-  XMLUtils::GetString(pControlNode, "posx", pos);
-  if (pos.Right(1) == "r")
-    posX = rect.Width() - posX;
-  XMLUtils::GetString(pControlNode, "posy", pos);
-  if (pos.Right(1) == "r")
-    posY = rect.Height() - posY;
-
-  GetDimension(pControlNode, "width", width, minWidth);
-  GetDimension(pControlNode, "height", height, minHeight);
+  {
+    // determine position and size of control
+    // horizontal
+    bool hasLeft = false;
+    bool hasWidth = false;
+
+    if (GetPosition(pControlNode, "left", posX, rect.Width()) ||
+        GetPosition(pControlNode, "posx", posX, rect.Width()))
+      hasLeft = true;
+
+    if (GetDimension(pControlNode, "width", width, minWidth, rect.Width()))
+      hasWidth = true;
+
+    if (hasLeft != hasWidth) // poor man xor, we have to have at least 1 to continue
+    {
+      // if we have just one of <posx>, <width> we search for <right>
+      float right;
+      if (GetPosition(pControlNode, "right", right, rect.Width()))
+      {
+        if (hasLeft)
+          width = (rect.Width() - right) - posX;
+        else // if (hasWidth)
+          posX = (rect.Width() - right) - width;
+      }
+    }
+
+    // vertical
+    bool hasTop = false;
+    bool hasHeight = false;
+
+    if (GetPosition(pControlNode, "top", posY, rect.Height()) ||
+        GetPosition(pControlNode, "posy", posY, rect.Height()))
+      hasTop = true;
+
+    if (GetDimension(pControlNode, "height", height, minHeight, rect.Height()))
+      hasHeight = true;
+
+    if (hasTop != hasHeight) // poor man xor, we have to have at least 1 to continue
+    {
+      // if we have just one of <posy>, <height> we search for <bottom>
+      float bottom;
+      if (GetPosition(pControlNode, "bottom", bottom, rect.Height()))
+      {
+        if (hasTop)
+          height = (rect.Height() - bottom) - posY;
+        else // if (hasHeight)
+          posY = (rect.Height() - bottom) - height;
+      }
+    }
+  }
+
   XMLUtils::GetFloat(pControlNode, "offsetx", offset.x);
   XMLUtils::GetFloat(pControlNode, "offsety", offset.y);
 
diff --git a/xbmc/guilib/GUIControlFactory.h b/xbmc/guilib/GUIControlFactory.h
index 4f2bd03e3f295..b3b482137f3ad 100644
--- a/xbmc/guilib/GUIControlFactory.h
+++ b/xbmc/guilib/GUIControlFactory.h
@@ -72,7 +72,7 @@ class CGUIControlFactory
    \param min minimum value - set != 0 if auto is used.
    \return true if we found and read the tag.
    */
-  static bool GetDimension(const TiXmlNode* pRootNode, const char* strTag, float &value, float &min);
+  static bool GetDimension(const TiXmlNode* pRootNode, const char* strTag, float &value, float &min, float parentSize);
   static bool GetAspectRatio(const TiXmlNode* pRootNode, const char* strTag, CAspectRatio &aspectRatio);
   static bool GetInfoTexture(const TiXmlNode* pRootNode, const char* strTag, CTextureInfo &image, CGUIInfoLabel &info, int parentID);
   static bool GetTexture(const TiXmlNode* pRootNode, const char* strTag, CTextureInfo &image);
@@ -102,6 +102,8 @@ class CGUIControlFactory
   static bool GetHitRect(const TiXmlNode* pRootNode, CRect &rect);
   static bool GetScroller(const TiXmlNode *pControlNode, const CStdString &scrollerTag, CScroller& scroller);
 private:
+  static float ParsePosition(const char* pos, float parentSize);
+  static bool GetPosition(const TiXmlElement *pControlNode, const char* strTag, float& value, float parentSize);
   static CStdString GetType(const TiXmlElement *pControlNode);
   static bool GetConditionalVisibility(const TiXmlNode* control, CStdString &condition, CStdString &allowHiddenFocus);
   bool GetString(const TiXmlNode* pRootNode, const char* strTag, CStdString& strString);