diff --git a/src/dlangui/dialogs/dialog.d b/src/dlangui/dialogs/dialog.d
index 263aef37..894ba2df 100644
--- a/src/dlangui/dialogs/dialog.d
+++ b/src/dlangui/dialogs/dialog.d
@@ -64,6 +64,17 @@ class Dialog : VerticalLayout {
         _icon = "dlangui-logo1";
     }
 
+    /** 
+        Measure widget according to desired width and height constraints. (Step 1 of two phase layout). 
+    */
+    void measure(int parentWidth, int parentHeight) { 
+        super.measure(parentWidth, parentHeight);
+        if ((_flags & DialogFlag.Resizable) && (_flags & DialogFlag.Popup)) {
+            Point sz = Point(_parentWindow.width * 4 / 5, _parentWindow.height * 4 / 5);
+            measuredContent(parentWidth, parentHeight, sz.x, sz.y);
+        }
+    }
+
     /// get icon resource id
     @property string windowIcon() {
         return _icon;
@@ -204,6 +215,7 @@ class DialogFrame : WindowFrame {
     protected Dialog _dialog;
     this(Dialog dialog, bool enableCloseButton) {
         super(dialog.id ~ "_frame", enableCloseButton);
+        styleId = STYLE_FLOATING_WINDOW;
         _dialog = dialog;
         _caption.text = _dialog.windowCaption.value;
         bodyWidget = _dialog;
diff --git a/src/dlangui/dialogs/filedlg.d b/src/dlangui/dialogs/filedlg.d
index 2e61ec0e..0b541eb5 100644
--- a/src/dlangui/dialogs/filedlg.d
+++ b/src/dlangui/dialogs/filedlg.d
@@ -69,6 +69,8 @@ struct FileFilterEntry {
 	}
 }
 
+__gshared bool SHOW_FILE_DIALOG_IN_POPUP = true;
+
 /// File open / save dialog
 class FileDialog : Dialog, CustomGridCellAdapter {
 	protected FilePathPanel _edPath;
@@ -90,7 +92,7 @@ class FileDialog : Dialog, CustomGridCellAdapter {
     protected bool _isOpenDialog;
 
 	this(UIString caption, Window parent, Action action = null, uint fileDialogFlags = DialogFlag.Modal | DialogFlag.Resizable | FileDialogFlag.FileMustExist) {
-        super(caption, parent, fileDialogFlags);
+        super(caption, parent, fileDialogFlags | (SHOW_FILE_DIALOG_IN_POPUP ? DialogFlag.Popup : 0));
         _isOpenDialog = !(_flags & FileDialogFlag.ConfirmOverwrite);
         if (action is null) {
             if (_isOpenDialog)
diff --git a/src/dlangui/widgets/styles.d b/src/dlangui/widgets/styles.d
index cdcde587..997e0282 100644
--- a/src/dlangui/widgets/styles.d
+++ b/src/dlangui/widgets/styles.d
@@ -134,6 +134,8 @@ immutable string STYLE_DOCK_WINDOW = "DOCK_WINDOW";
 immutable string STYLE_DOCK_WINDOW_CAPTION_LABEL = "DOCK_WINDOW_CAPTION_LABEL";
 /// standard style id for dock window body
 immutable string STYLE_DOCK_WINDOW_BODY = "DOCK_WINDOW_BODY";
+/// standard style id for toolbar separator
+immutable string STYLE_FLOATING_WINDOW = "FLOATING_WINDOW";
 
 /// standard style id for tab control in dock frame
 immutable string STYLE_TAB_UP_DARK = "TAB_UP_DARK";
diff --git a/views/res/mdpi/popup_window_background.9.png b/views/res/mdpi/popup_window_background.9.png
new file mode 100644
index 00000000..14d80259
Binary files /dev/null and b/views/res/mdpi/popup_window_background.9.png differ
diff --git a/views/res/theme_default.xml b/views/res/theme_default.xml
index b7460ee0..7f890da2 100644
--- a/views/res/theme_default.xml
+++ b/views/res/theme_default.xml
@@ -263,6 +263,13 @@
         padding="1,1,1,1"
         margins="4,4,4,4"
         />
+    <style id="FLOATING_WINDOW"
+        backgroundImageId="popup_window_background"
+        layoutWidth="FILL_PARENT"
+        layoutHeight="FILL_PARENT"
+        padding="1,1,1,1"
+        margins="4,4,4,4"
+        />
     <style id="DOCK_WINDOW_CAPTION"
         backgroundColor="#4d6082"
         layoutWidth="FILL_PARENT"
diff --git a/views/standard_resources.list b/views/standard_resources.list
index a2163b3a..4fd73596 100644
--- a/views/standard_resources.list
+++ b/views/standard_resources.list
@@ -66,6 +66,7 @@ res/mdpi/folder-bookmark.png
 res/mdpi/folder-network.png
 res/mdpi/folder.png
 res/mdpi/media-flash-sd-mmc.png
+res/mdpi/popup_window_background.9.png
 res/mdpi/tab_btn_dark_up_focused.9.png
 res/mdpi/tab_btn_dark_up_focused_selected.9.png
 res/mdpi/tab_btn_dark_up_hover.9.png