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Show text when you press a button

I would like to know a way to make some text appear when you press a button.
I've already created a button and a text box:
<Button Height="25" Width="200" Click="Button_Click" Content="Press this button"/>
<TextBlock Height="50" Width="300" Margin="243,147,249,222" TextAlignment="Center" FontSize="30"/>
Also, I've created a boolean for when you press the button, I don´t know if this is necessary or not.
private void Button_Click(object sender, RoutedEventArgs e)
{
Boolean button = true;
}

Basically, like MaxB said, every control in WPF has a "Visibility" property, that you can change between Visible, Collapsed or Hidden.
Since you already have a Handle for the Button_Click event, all you need to do now is give a name to your TextBlock with the x:Name property like-so :
<TextBlock x:Name="MyTextBlock"/>
Then, in the code of your handler, you can choose which Visibility to apply to the TextBlock according to the state of your boolean.
You can access the TextBlock properties by the name you gave it in the XAML file, like-so :
this.MyTextBlock.Visibility = Visibility.Hidden, for example.

You didn't create a textbox you created a textblock. Firstly create a textbox and give it a name. Then on your Button_click method you can write NameOfTextBox.Text = "Your text";

Xamarin button works on second click

i have a mobile application and once i press a button i want the border of the button to be changed. Which I managed to do however it works only if i click on the first button twice and then the rest works well. All button are identical just the name is different
here is the code for the button
protected void EnglishToCzech_Clicked(object sender, EventArgs e)
{
Button englishToCzech = (Button)sender;
if (englishToCzech.BorderColor.Equals(Color.Default))
{
englishToCzech.BorderColor = Color.FromHex("#da2c43");
czechToEnglish.BorderColor = Color.Default;
english.BorderColor = Color.Default;
}
else
englishToCzech.BorderColor = Color.Default;
}
and here is the xaml
<Button x:Name="englishToCzech" Grid.Column="2" Text="{ grial:Translate A_ButtonEnglishToCzech}" Style="{ StaticResource CircleActionButtonFlatStyle }" FontSize="14" WidthRequest="50" HeightRequest="50" CornerRadius="30" BorderWidth="2" Clicked="EnglishToCzech_Clicked"/>
Is there a way to set it in code how many times user have to pres the button in order for it work at the first click?

Debug your code. Put a breakpoint in EnglishToCzech_Clicked and ensure that you are getting in this method on each click. During the first execution, hover over englishToCzech.BorderColor and see what the value is. Likely, the BorderColor isn't Color.Default so it gets set to Color.Default. This is why it works the second time.

How do I make a Popup included in it's parent Control for the sake of mouse events?

I have a Control that contains a Popup. I am trying to close the Popup whenever someone clicks outside of the Control. This is the part of my code that sets up the problem:
AddHandler(Mouse.PreviewMouseDownOutsideCapturedElementEvent, new MouseuttonEventHandler(HandleOutsideClick), true);
Now whenever I click in the Popup it causes PreviewMouseDownOutsideCapturedElementEvent to be raised. Am I misunderstanding this event? Is there something that I can do to have the Popup be considered a part of the Control so that it doesn't raise this event?

Does this work?
<Popup Name="Pop" LostFocus="ClosePop"/>
private void ClosePop(object sender, RoutedEventArgs e)
{
Pop.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}
Put the XAML code in your .xaml page and the C# code in the related .xaml.cs file.
Note: You may need to put the focus on the popup before this works, it may be done automatically; I haven't done this on popups, but I have done it on other objects.
Update: This works for me, clicking in the TextBox that says Test1 opens the Popup, and clicking in the TextBox labeled Test2 closes it:
<Grid Background="White">
<StackPanel>
<TextBox Foreground="Black" LostFocus="ClosePop" GotFocus="OpenPop" Height="50">Test1</TextBox>
<TextBox Foreground="Black" Height="50">Test2</TextBox>
</StackPanel>
<Popup Name="Pop" Height="50" Width="50">
<TextBlock Foreground="White" VerticalAlignment="Center" HorizontalAlignment="Center">Pop!</TextBlock>
</Popup>
</Grid>
private void ClosePop(object sender, RoutedEventArgs e)
{
Pop.IsOpen = false;
}
private void OpenPop(object sender, RoutedEventArgs e)
{
Pop.IsOpen = true;
}

Button with image blue background

I create a button with image in my app:
<Button x:Name="favoriteButton" HorizontalAlignment="Left" VerticalAlignment="Top" Height="72" Width="99" Click="DidPressAddToFavorites" BorderBrush="{x:Null}" Foreground="{x:Null}">
<Button.Background>
<ImageBrush ImageSource="/Images/favouritesBWIcon#2x.png" Stretch="Uniform"/>
</Button.Background>
</Button>
And i noticed that when the user press the button all the button became blue and when i release the button i see it again. any idea how to fix it?
Edit:
This is the handler method:
private void DidPressAddToFavorites(object sender, RoutedEventArgs e)
{
if (favoriteRep.ExistInFavorites(currentItem) == true)
{
this.SetButtonWithImage(favoriteButton, "/Images/favouritesBWIcon#2x.png");
favoriteRep.RemoveFromFavorites(currentItem);
}
else
{
this.SetButtonWithImage(favoriteButton, "/Images/favouritesIcon#2x.png");
favoriteRep.AddToFavorites(currentItem);
}
}

Because you didn't add the States, there are three states Normal, MouseOver, Pressed... You have to set the image for all three states, to make it work of your wish. Here the alternate to do so, didn't know about any better way available from c#, all you have to do is to add two more eventHndlers Mouse over event and press event, then set the image in both of them....
Well there's another good way to do so is try template editing from blend Software

StackOverflowException when trying to show a ContextMenu and clicking on its parent

I've encountered a weird behavior in WPF. Even though there are quite a few ways to avoid this problem, I'm trying to better understand why it's happening:
I created a new WPF application, just added a button which has a ContextMenu:
<Grid>
<Button x:Name="btnTest" Margin="10,10,10,10"
MouseEnter="BtnTest_OnMouseEnter" MouseLeave="BtnTest_OnMouseLeave">
<Button.ContextMenu>
<ContextMenu x:Name="myContext">
<TextBlock Text="Context Menu Text"></TextBlock>
</ContextMenu>
</Button.ContextMenu>
</Button>
</Grid>
In the code behind I use MouseEnter to show the ContextMenu and MouseLeave to hide it:
private void BtnTest_OnMouseEnter(object sender, MouseEventArgs e)
{
myContext.PlacementTarget = btnTest;
myContext.Placement = PlacementMode.Bottom;
myContext.IsOpen = true;
}
private void BtnTest_OnMouseLeave(object sender, MouseEventArgs e)
{
myContext.IsOpen = false;
}
So now - I see the ContextMenu under the button when the mouse is on the button and it hides when the mouse leaves the button.
BUT when I click the button I get an exception
An unhandled exception of type 'System.StackOverflowException'
occurred in WindowsBase.dll
Question is - Why is the Mouse Click, specifically, triggering this exception? I don't have any code of mine running on the Click event, yet without clicking an exception doesn't occur...
BTW: Same will happen if I replace the Button with an Image for instance, so it doesn't seem to be caused by a specific control...

Change your XAML like this:
<Grid>
<Popup x:Name="myContext">
<TextBlock Text="Context Menu Text"></TextBlock>
</Popup>
<Button x:Name="btnTest" Margin="10,10,10,10"
MouseEnter="BtnTest_OnMouseEnter" MouseLeave="BtnTest_OnMouseLeave">
</Button>
</Grid>
I think there is a loop of this sort going on in your code:
you enter the button, the popup shows
you click, popup hides (default behavior of contextmenu)
button gets focus, popup is shown again
What happens if you set the ´StaysOpen´ property of the ContextMenu? If you then dont get this behavior anymore my suspicion is correct.