diff --git a/src/designer/src/designer/mainwindow.cpp b/src/designer/src/designer/mainwindow.cpp
index 3cac161189b8fca7e40a6a09787150128423aa89..444fb8908b7360407503276d73d1352c40d4ab34 100644
--- a/src/designer/src/designer/mainwindow.cpp
+++ b/src/designer/src/designer/mainwindow.cpp
@@ -151,6 +151,8 @@ DockedMdiArea::DockedMdiArea(const QString &extension, QWidget *parent) :
     QMdiArea(parent),
     m_extension(extension)
 {
+    setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
+    setLineWidth(1);
     setAcceptDrops(true);
     setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
     setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);