Problem with Multiple Line

[Priso_Gold]

Problem 1:

My code:

Result: they are overlapping

Problem 2:

My code:

Result: There are strange characters appear when have indent space

How I can resolve them?

[Edwin_Reynoso]

Use a StackPanel:

<StackPanel>
    <Text Value="Hello"/>
    <Text Value="World" />
</StackPanel>