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Controlling the open and close of Popup from a Button click in WPF

My requirement is to control the closing/opening of popup from a Button. In my below piece of code by clicking on button the popup opens up but it doesn't closes on the next click.
XAML
<Button x:Name="Btn" Height="20" Width="120" HorizontalAlignment="Center"
VerticalAlignment="Center">
<TextBlock Text="Show Popup"/>
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Click">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames
Storyboard.TargetName="Popup"
Storyboard.TargetProperty="IsOpen">
<DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="True" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Button.Triggers>
</Button>
<Popup x:Name="Popup" StaysOpen="False"
Height="100" Width="300" Background= "Yellow"
PlacementTarget="{Binding ElementName=Btn}"></Popup>
Note: I am able to achieve the above case using a Toggle button, But my requirement is very specific to button only.

You can't do it without toggling i.e. Button alone can't do it. You are handling a control that has a state: opened and closed. You need to know the current state. To achieve this, add a flag to the hosting control (requires code-behind) or use the flag of the Popup (requires code-behind) or use the flag of the ToggleButton (no code-behind).
It doesn't make any sense to avoid the ToggleButton: it's a Button that additionally knows or has a state. It can handle ICommand or emit a Click event - it's a Button. It's exactly what you need.
You don't have to explicitly add a TextBlock to the Content of the Button. When assigning a string to Button.Content, the control will automatically create a TextBlock to show the string.
MainWindow.xaml
<Button Click="TogglePopup_OnClick"
Content="Show Popup" />
<Popup x:Name="Popup" />
MainWindow.xaml.cs
private void TogglePopup_OnClick(object sender, EventArgs e)
=> this.Popup.IsOpen ^= true;

Windows 8.1 Store App: FadeInThemeAnimation when page loads

I'm trying to do a fade in page transition. The fade out transition works but when I try to do a fade in it doesn't seem to do anything, or perhaps is too fast.
My XAML Code:
<Page
x:Class="CYBOracleProject.Chapter1_1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:CYBOracleProject"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Page.Resources>
<Storyboard x:Name="FadeInTransition">
<FadeInThemeAnimation Storyboard.TargetName="StartPage1" />
</Storyboard>
</Page.Resources>
<Grid x:Name="StartPage1" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Image Source="Image/hallway.jpg" Stretch="Fill" />
</Grid>
For the EventHandler I tried Loaded but it didn't work.

I would probably do this using the Behaviors SDK using ControlStoryboardAction
If you want to do it from code-behind use DoubleAnimation with the Opacity property instead of FadeInThemeAnimation.
XAML
<Storyboard x:Name="FadeInTransition">
<DoubleAnimation Storyboard.TargetName="StartPage1"
Storyboard.TargetProperty="Opacity" From="0.0"
To="1.0" Duration="0:0:1" />
</Storyboard>
Loaded event:
FadeInTransition.Begin();

Perform Event Trigger on DataGrid for DragEnter causing XAML exception

I am working on a c# wpf project and I have run in to a problem relating to firing an trigger within the XAML.
What I am trying to achieve is when the drags a file into the grid, it should animate the background colour change but for some reason it keeps on throwing an exception as soon as I run the program. I am getting the following error:
'Provide value on
'System.Windows.Baml2006.TypeConverterMarkupExtension' threw an
exception.' Line number '9' and line position '14'.
Below is the XAML code
<UserControl x:Class="ReportReader.UserControls.ReportDragDropControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008">
<Grid AllowDrop="True" DragDrop.DragOver="Grid_DragOver"
DragDrop.DragEnter="Grid_DragEnter" DragDrop.Drop="Grid_Drop" DragDrop.DragLeave="Grid_DragLeave">
<Grid.Triggers>
<EventTrigger RoutedEvent="Grid.DragEnter">
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="#cecece" Storyboard.TargetProperty="(Grid.BackgroundColor).(SolidColorBrush.Color)" FillBehavior="Stop" Duration="0.0.1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Grid.Triggers>
<TextBlock Margin="12,12,20,12" Name="txtDragDropStatus" Text="Drag file here or use file menu to load your report" TextAlignment="Center" FontSize="30" FontWeight="Bold" TextWrapping="WrapWithOverflow" Width="835" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Grid>
</UserControl>
Thanks for any help you can provide.

There are two errors in your XAML file -
BackgroundColor is not a Dependency Property, instead use Background.
0.0.1 is not a valid value for TimeSpan. It should be 0:0:1.
This will work fine -
<ColorAnimation To="#cecece"
Storyboard.TargetProperty="(Grid.Background)
.(SolidColorBrush.Color)"
FillBehavior="Stop" Duration="0:0:1" />
Also, to allow animation on background property, you should set it to some default value.
<Grid Background="White"/>
I tried with this sample and its working fine on drag enter -
<Grid AllowDrop="True" Background="White" DragDrop.DragEnter="Grid_DragEnter">
<Grid.Triggers>
<EventTrigger RoutedEvent="Grid.DragEnter">
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="#cecece"
Storyboard.TargetProperty="(Grid.Background).
(SolidColorBrush.Color)"
FillBehavior="Stop" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
/EventTrigger>
</Grid.Triggers>
<TextBlock Margin="12,12,20,12" Name="txtDragDropStatus"
Text="Drag file here or use file menu to load your report"/>
</Grid>

Animation limited by panel

It's a little hard to describe but I'll try my best.
I have a control which has an image and a label and it needs to have 2 states ("Big", and "Small").
On the "Big" state the image should be centered at the top of the control, and the label should be center below (Just like a dock with an image and a label docked to the top).
On the "Small" state the image should be smaller and at the top left of the control, and the label should be right next to it.
The big state should look like so:
And the small state:
And the tricky part: when I switch between them I need it to animate over 0.3s.
There is no panel I found suitable for this.
DockPanel is a good solution for both of these states, but it can't animate it.
Canvas can animate it, but doesn't have a proper layout (can't center them so easily).
What would be the best way to do it?

In WPF no animation alignment, the only thing that can come up - it ThicknessAnimation. But you can use the DiscreteObjectKeyFrame to set the alignment. Below is a simple demonstration in which to Label set VerticalAlignment in Bottom:
<Grid>
<Grid.Triggers>
<EventTrigger SourceName="Small" RoutedEvent="Button.Click">
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="Test" Storyboard.TargetProperty="VerticalAlignment">
<DiscreteObjectKeyFrame KeyTime="0:0:0">
<DiscreteObjectKeyFrame.Value>
<VerticalAlignment>Bottom</VerticalAlignment>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Grid.Triggers>
<Label x:Name="Test" Content="Test" Width="300" Height="300" Background="Aqua" VerticalAlignment="Top" HorizontalAlignment="Center" />
<Button Name="Small" Content="Small" Width="100" Height="30" HorizontalAlignment="Right" VerticalAlignment="Top" />
</Grid>
Using it in combination with standard animations, such as DoubleAnimation, I think you'll be able to achieve this goal.

Checkbox triggers stackpanel expand/collapse animation

I have WP7 application with simple phone page.
I have check box
<CheckBox Content="Click me" Margin="0,2,0,0">
When I check the checkbox I want Stack panel below it to expand.
<StackPanel Height="0" x:Name="MyStackPanel">
<CheckBox Content="Condition"/>
</StackPanel>
Right now I tried this solution, but i receive exception that EventTrigger.RoutedEvent cannot be assign to Checkbox.Checked.
<CheckBox Content="Click Me" Margin="0,2,0,0">
<CheckBox.Triggers>
<EventTrigger RoutedEvent="CheckBox.Checked">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetName="MyStackPanel"
Storyboard.TargetProperty="Height"
To="100"
Duration="0:0:0.5" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</CheckBox.Triggers>
</CheckBox>
Do you have any ideas what is the best approach to implement such animation?
Thanks

There is a control for what you require to do. You should be using the Expander control that iss part of the silverlight toolkit . There iS A good two part tutorial about working with this control here on WindowsPhoneGeek.
Basically, you use the expander control and implement your own custom controls for the header and the items.

try ToggleButton.Checked instead of CheckBox.Checked