Update sample page to use the new API

Author: maxkatz6

samples/ControlCatalog/MainView.xaml

@@ -69,6 +69,9 @@
       <TabItem Header="CalendarDatePicker">
         <pages:CalendarDatePickerPage />
       </TabItem>
+      <TabItem Header="Dialogs">
+        <pages:DialogsPage />
+      </TabItem>
       <TabItem Header="Drag+Drop">
         <pages:DragAndDropPage />
       </TabItem>

samples/ControlCatalog/MainView.xaml.cs

@@ -24,11 +24,6 @@ public MainView()
             {
                 IList tabItems = ((IList)sideBar.Items);
                 tabItems.Add(new TabItem()
-                {
-                    Header = "Dialogs",
-                    Content = new DialogsPage()
-                });
-                tabItems.Add(new TabItem()
                 {
                     Header = "Screens",
                     Content = new ScreenPage()

samples/ControlCatalog/Pages/DialogsPage.xaml

@@ -1,29 +1,57 @@
-<UserControl xmlns="https://github.com/avaloniaui"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             x:Class="ControlCatalog.Pages.DialogsPage">
-  <StackPanel Orientation="Vertical" Spacing="4" Margin="4">
-      <CheckBox Name="UseFilters">Use filters</CheckBox>
-      <Button Name="OpenFile">_Open File</Button>
-      <Button Name="OpenMultipleFiles">Open _Multiple File</Button>
-      <Button Name="SaveFile">_Save File</Button>
-      <Button Name="SelectFolder">Select Fo_lder</Button>
-      <Button Name="OpenBoth">Select _Both</Button>
+<UserControl x:Class="ControlCatalog.Pages.DialogsPage"
+             xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+  <StackPanel Margin="4"
+              Orientation="Vertical"
+              Spacing="4">
 
-      <TextBlock x:Name="PickerLastResultsVisible"
-                 Classes="h2"
-                 IsVisible="False"
-                 Text="Last picker results:" />
-      <ItemsPresenter x:Name="PickerLastResults" />
+    <TextBlock Text="Windows:" />
 
-      <TextBlock Margin="0, 8, 0, 0"
-                 Classes="h1"
-                 Text="Window dialogs" />
-      <Button Name="DecoratedWindow">Decorated _window</Button>
-      <Button Name="DecoratedWindowDialog">Decorated w_indow (dialog)</Button>
-      <Button Name="Dialog" ToolTip.Tip="Shows a dialog">_Dialog</Button>
-      <Button Name="DialogNoTaskbar">Dialog (_No taskbar icon)</Button>
-      <Button Name="OwnedWindow">Own_ed window</Button>
-      <Button Name="OwnedWindowNoTaskbar">Owned window (No tas_kbar icon)</Button>
+    <Expander Header="Window dialogs">
+      <StackPanel Spacing="4">
+        <Button Name="DecoratedWindow">Decorated _window</Button>
+        <Button Name="DecoratedWindowDialog">Decorated w_indow (dialog)</Button>
+        <Button Name="Dialog" ToolTip.Tip="Shows a dialog">_Dialog</Button>
+        <Button Name="DialogNoTaskbar">Dialog (_No taskbar icon)</Button>
+        <Button Name="OwnedWindow">Own_ed window</Button>
+        <Button Name="OwnedWindowNoTaskbar">Owned window (No tas_kbar icon)</Button>
+      </StackPanel>
+    </Expander>
+
+    <TextBlock Margin="0,20,0,0" Text="Pickers:" />
+
+    <CheckBox Name="UseFilters">Use filters</CheckBox>
+    <CheckBox Name="ForceManaged">Force managed dialog</CheckBox>
+    <Expander Header="FilePicker API">
+      <StackPanel Spacing="4">
+        <Button Name="OpenFolderPicker">Select Fo_lder</Button>
+        <Button Name="OpenFilePicker">_Open File</Button>
+        <Button Name="OpenMultipleFilesPicker">Open _Multiple File</Button>
+        <Button Name="SaveFilePicker">_Save File</Button>
+        <Button Name="OpenFileFromBookmark">Open File Bookmark</Button>
+        <Button Name="OpenFolderFromBookmark">Open Folder Bookmark</Button>
+      </StackPanel>
+    </Expander>
+    <Expander Header="Legacy OpenFileDialog">
+      <StackPanel Spacing="4">
+        <Button Name="OpenFile">_Open File</Button>
+        <Button Name="OpenMultipleFiles">Open _Multiple File</Button>
+        <Button Name="SaveFile">_Save File</Button>
+        <Button Name="SelectFolder">Select Fo_lder</Button>
+        <Button Name="OpenBoth">Select _Both</Button>
+      </StackPanel>
+    </Expander>
+
+    <TextBlock x:Name="PickerLastResultsVisible"
+               Classes="h2"
+               IsVisible="False"
+               Text="Last picker results:" />
+    <ItemsPresenter x:Name="PickerLastResults" />
+
+    <TextBox Name="BookmarkContainer" Watermark="Bookmark" />
+    <TextBox Name="OpenedFileContent"
+             MaxLines="10"
+             Watermark="Picked file content" />
 
   </StackPanel>
 </UserControl>