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Access PlaceHolderText property of Textbox and set it to initially value once the Page/User Control loads

I am working on a UWP app and I have implemented a UserControl.The user control has multiple Textboxes and the usercontrol has been implemented in a different view page. I want to make sure that whenever the View page loads, all the textboxes have Enteras the default text that goes off when the textbox is highlighted.
My UserControl has this implementation
<UserControl >
---------------------------
----------------------------
<Border Grid.Row="1" Grid.Column="2" BorderBrush="{StaticResource brush}" BorderThickness="0,3,0,0" >
<local:NumericTextBox x:Name="TaxifuelRevised" IsEnabled="{Binding FuelPlanInfo.IsTappable}" Tag="TaxiFuelActual" TextAlignment="Right" Text="{Binding FuelPlanInfo.TaxiFuelActualInPreferredUnit,ElementName=rootFuelControl,Mode=TwoWay,UpdateSourceTrigger=Explicit}"
Margin="0,0,40,0" Style="{StaticResource TransparentTextBox}" HorizontalAlignment="Right" VerticalAlignment="Center" Foreground="#FF0078D7"
BorderBrush="{x:Null}" Background="{x:Null}" FontSize="40" FontFamily="Helvetica" InputScope="Number"
KeyDown="TextBox_KeyDown" MaxLength="5" GotFocus="TextBox_GotFocus" LostFocus="TextBox_LostFocus" Tapped="KeyBoardInputScope_Tapped" />
</Border>
</UserControl>
The view where it has been implemented is
<Pivot x:Name="MyPivot" Grid.Row="1" ManipulationMode="None" Margin="115,10,90,20" SelectionChanged="MyPivot_SelectionChanged" HorizontalAlignment="Stretch" Width="2536" >
<PivotItem Tag="Fuel Plan" Margin="0" ManipulationMode="None">
<PivotItem.Header >
<StackPanel >
<Image Name="FuelPlanImage" Source="ms-appx:///Assets/fuel_plan_icon.png" Width="82" Height="80"></Image>
<TextBlock Margin="0,8,0,0" TextAlignment="Center" Text="Fuel Plan" FontSize="40"/>
</StackPanel>
</PivotItem.Header>
<local:FuelPlan x:Name="FuelPlanUC" HorizontalAlignment="Stretch" FuelPlanInfo="{x:Bind ViewModel.FuelPlanInfo, Mode=OneWay}"></local:FuelPlan>
</PivotItem>

Checkout the PlaceholderText property of the TextBoxControl.

Windows Phone 8.1 ScrollView: auto-height

I would like to ceate a text block inside a scroll view. I want the scroll view to be automatic on every device and every screen size. But for the moment, I am forced to fix an height, in pixels. Otherwise, the scroll view will adapt to the text size... Without doing its scrolling job.
How to do this properly?
Thanks!
EDIT: here is my XAML:
<Grid>
<StackPanel Orientation="Vertical" Margin="10,10,10,10">
<ProgressBar x:Name="progressBar" IsIndeterminate="True" IsEnabled="True" />
<TextBlock x:Name="titleBlock" Text="" VerticalAlignment="Top" FontSize="48"/>
<TextBlock x:Name="subtitleBlock" Text="" TextWrapping="Wrap" FontSize="24" FontStyle="Italic"/>
<TextBlock x:Name="dateBlock" TextWrapping="Wrap" Text="" FontSize="24"/>
<ScrollViewer VerticalAlignment="Top" Height="370" VerticalScrollBarVisibility="Visible" Margin="0,15,0,0" VerticalScrollMode="Enabled" AllowDrop="False" BringIntoViewOnFocusChange="True" HorizontalScrollMode="Disabled" IsHoldingEnabled="True" >
<Grid>
<TextBlock x:Name="descriptionBlock" TextWrapping="Wrap" Text="" FontSize="14.667"/>
</Grid>
</ScrollViewer>
<Button x:Name="buttonViewFlyer" Click="buttonViewFlyer_Click" Content="Voir le flyer" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="5,5,5,0"/>
<Button x:Name="buttonViewFacebookPage" Click="buttonViewFacebookPage_Click" Content="Page Facebook de l'évènement" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="5,0,5,5"/>
</StackPanel>
</Grid>
I want the scrollview to have a height that adapts with device screen size.

How do i access a control within a hub section data template windows phone 8.1

Ok I have been working on an app for awhile now this is my first windows phone app I have made and I have been running into a problem. The way I designed my app is my start page is a hub control and I have two textboxs and a date picker on each page and some other controls. Now what I want to do is when I press the add button on a given section then I want to take all the strings from my various controls and add it to a textfile that I will later use. My problem is when I make the event for the button I cannot access the controls because they are inside the hubs data template. I have looked a many other examples on how to get around this they just dont seem to work and I cant make sense of them. So if anyone on here has the patience to kinda step me through the process that would be wonderful. Thank you for any help.
<Page.Resources>
<DataTemplate x:Key="DataTemplate1">
<Grid>
<TextBlock HorizontalAlignment="Left" Margin="85,7,0,0" TextWrapping="Wrap" Text=":" VerticalAlignment="Top" FontSize="21.333"/>
<TextBox x:Name="tbHours" LostFocus="tbHours_LostFocus" HorizontalAlignment="Left" Margin="0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" InputScope="Number" PlaceholderText=" hrs" Width="80"/>
<TextBox x:Name="tbMinutes" LostFocus="tbMinutes_LostFocus" HorizontalAlignment="Left" Margin="95,0,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" InputScope="Number" PlaceholderText=" min" Width="80"/>
<TextBlock HorizontalAlignment="Left" Margin="0,50,0,0" TextWrapping="Wrap" Text="Work date" VerticalAlignment="Top" FontSize="14.667"/>
<DatePicker LostFocus="DatePicker_LostFocus" HorizontalAlignment="Left" Margin="0,65,0,0" VerticalAlignment="Top" Width="127"/>
<AppBarButton x:Name="abtnAddHours" HorizontalAlignment="Left" Icon="Add" Label="" Margin="118,65,0,0" VerticalAlignment="Top" Click="abtnAddHours_Click"/>
</Grid>
</DataTemplate>
<DataTemplate x:Key="DataTemplate2">
<Grid>
<TextBlock HorizontalAlignment="Left" Margin="0,7,0,0" TextWrapping="Wrap" Text="$" VerticalAlignment="Top" FontSize="21.333"/>
<TextBox x:Name="tbExpenses" LostFocus="tbExpenses_LostFocus" HorizontalAlignment="Left" Margin="15,0,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" InputScope="Number" PlaceholderText=" 0.00" Width="100"/>
<TextBlock HorizontalAlignment="Left" Margin="0,45,0,0" TextWrapping="Wrap" Text="Expense date" VerticalAlignment="Top" FontSize="14.667"/>
<DatePicker x:Name="dtpkrExpenses" LostFocus="dtpkrExpenses_LostFocus" HorizontalAlignment="Left" Margin="0,60,0,0" VerticalAlignment="Top" Width="115"/>
<TextBlock HorizontalAlignment="Left" Margin="0,115,0,0" TextWrapping="Wrap" Text="Expense notes" VerticalAlignment="Top" FontSize="14.667"/>
<TextBox x:Name="tbNotes" LostFocus="tbNotes_LostFocus" HorizontalAlignment="Left" Margin="0,140,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="200"/>
<AppBarButton x:Name="abtnAddExpense" HorizontalAlignment="Left" Icon="Add" Label="" Margin="193,128,0,0" VerticalAlignment="Top"/>
</Grid>
</DataTemplate>
<DataTemplate x:Key="DataTemplate3">
<Grid>
<TextBlock HorizontalAlignment="Left" Margin="0" TextWrapping="Wrap" VerticalAlignment="Top" FontSize="14.667" Text="Working hour rate" Height="20"/>
<TextBlock HorizontalAlignment="Left" Margin="0,32,0,0" TextWrapping="Wrap" VerticalAlignment="Top" FontSize="21.333" Text="$"/>
<TextBox x:Name="tbWage" LostFocus="tbWage_LostFocus" HorizontalAlignment="Right" Margin="0,25,237,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" InputScope="Number" PlaceholderText=" 0.00" Width="89"/>
<AppBarButton x:Name="abtnAddWage" HorizontalAlignment="Left" Icon="Add" Label="" Margin="92,14,0,0" VerticalAlignment="Top"/>
</Grid>
</DataTemplate>
</Page.Resources>
<Page.BottomAppBar>
<CommandBar ClosedDisplayMode="Compact">
<CommandBar.SecondaryCommands>
<AppBarButton Label="Reset"/>
</CommandBar.SecondaryCommands>
<AppBarButton x:Name="abtnSummary" Icon="List" Label="Summary" Click="abtnSummary_Click"/>
</CommandBar>
</Page.BottomAppBar>
<Grid>
<Hub x:Name="Hub" Header="Hours+" Background="{ThemeResource PhoneAccentBrush}">
<HubSection x:Name="sctnAddHours" Header="Add hours" ContentTemplate="{StaticResource DataTemplate1}"/>
<HubSection x:Name="sctnAddExpenses" Header="Add expenses" ContentTemplate="{StaticResource DataTemplate2}"/>
<HubSection x:Name="sctnWage" Header="Wage" Height="580" ContentTemplate="{StaticResource DataTemplate3}"/>
</Hub>
</Grid>

Use the Loaded event of the control you want to access and assign it to a local variable like this.
XAML
<AppBarButton x:Name="abtnAddHours" Loaded="abtnAddHours_Loaded" HorizontalAlignment="Left" Icon="Add" Label="" Margin="118,65,0,0" VerticalAlignment="Top" />
Code Behind
//local variable
private TextBlock _abtnAddHours;
//Loaded event of the TextBlock from the template
private void abtnAddHours_Loaded(object sender, RoutedEventArgs e)
{
_abtnAddHours = (TextBlock)sender;
//Add the event handler for the Click event
_abtnAddHours.Click += _abtnAddHours_Click;
}
private void _abtnAddHours_Click(object sender, RoutedEventArgs e)
{
//Put your logic here
}

WebBrowser does not redirect

I am wondering why my webbrowser doesn't redirect to my html page.
I have a linkbutton on my xaml page with a tap event and i'm creating my object webbrowser when i load first the page.
This is the code I am using :
private void web_Tap(object sender, GestureEventArgs e)
{
wbbrowser.Navigate(new Uri("http://mywebsite.com/index.html", UriKind.Absolute));
}
This is the Xaml i am using :
<controls:PanoramaItem Header="about me">
<!--Double line list with text wrapping-->
<StackPanel Margin="0,0,0,17" Width="432" Height="483" >
<Rectangle Height="186" Width="150" Margin="-250,0,9,10" >
<Rectangle.Fill>
<ImageBrush ImageSource="Img/id.jpg"></ImageBrush>
</Rectangle.Fill>
</Rectangle>
<TextBlock Text ="Name" TextWrapping="Wrap" Margin="12,-6,12,10" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
<TextBlock Text="age" TextWrapping="Wrap" Margin="12,-6,12,10" Style="{StaticResource PhoneTextSubtleStyle}"/>
<TextBlock Text="nationality" TextWrapping="Wrap" Margin="12,-6,12,10" Style="{StaticResource PhoneTextSubtleStyle}"/>
<TextBlock Text="adress" TextWrapping="Wrap" Margin="12,-6,12,10" Style="{StaticResource PhoneTextSubtleStyle}"/>
<TextBlock Text="phone" TextWrapping="Wrap" Margin="12,-6,12,10" Style="{StaticResource PhoneTextSubtleStyle}"/>
<TextBlock Text="email" TextWrapping="Wrap" Margin="12,-6,12,10" Style="{StaticResource PhoneTextSubtleStyle}"/>
<TextBlock Text="others" TextWrapping="Wrap" Margin="12,-6,12,10" Style="{StaticResource PhoneTextSubtleStyle}"/>
<HyperlinkButton Name="web" Content="web version" Margin="12,-6,12,10" Tap="web_Tap"></HyperlinkButton>
</StackPanel>
</controls:PanoramaItem>
So I am actually not declaring the Phone:WebBrowser.
I just create my object at the main page loaded .

First, you are using the HyperlinkButton the wrong way. You need to add a TargetName="NAME_OF_TARGET" for it to navigate. Second, use the NavigateUri property to navigate to a page instead of handling the tap.
This has been described in the MSDN documentation article.

Data binding in pivot TitleTemplate for Windows Phone

I must be missing something simple here...I am writing a Windows Phone 7 app and I have customized my pivot header to be the following:
<controls:Pivot Name="InfoPivot">
<controls:Pivot.TitleTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0,0,0,0" VerticalAlignment="Top">
<Rectangle Fill="{Binding CategoryFill}" Height="50" Width="50" Margin="355,25,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Name="CategoryRect" />
<StackPanel Margin="-425,-14,0,0" Width="432">
<TextBlock x:Name="StationTitle" Text="{Binding StationTitle}" Margin="10,0,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
<TextBlock Name="LocationTitle" Text="{Binding LocationTitle}" TextWrapping="Wrap" Margin="12,0,0,20" Style="{StaticResource PhoneTextNormalStyle}"/>
</StackPanel>
</StackPanel>
</DataTemplate>
</controls:Pivot.TitleTemplate>
When I navigate to this page, I pass Station and Location as parameters, and in the OnNavigatedTo() for this page I try to set the StationTitle and LocationTitle. Unfortunately, I end up getting:
Error 2 The name 'StationTitle' does not exist in the current context
How should/do we go about accessing members in the Pivot TitleTemplate? Any help will be appreciated! Thanks.

Stop using the title template and binding to acheive this. Try this instead:-
<controls:Pivot Name="InfoPivot">
<controls:Pivot.Title>
<StackPanel Orientation="Horizontal" Margin="0,0,0,0" VerticalAlignment="Top">
<Rectangle Fill="{Binding CategoryFill}" Height="50" Width="50" Margin="355,25,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Name="CategoryRect" />
<StackPanel Margin="-425,-14,0,0" Width="432">
<TextBlock x:Name="StationTitle" Margin="10,0,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
<TextBlock x:Name="LocationTitle" TextWrapping="Wrap" Margin="12,0,0,20" Style="{StaticResource PhoneTextNormalStyle}"/>
</StackPanel>
</StackPanel>
</controls:Pivot.Title>
Then in code-behind:-
if (NavigationContext.QueryString.TryGetValue("Station", out station))
{
StationTitle.Text = station;
}
if (NavigationContext.QueryString.TryGetValue("LocationTitle", out locationTitle))
{
LocationTitle.Text = locationTitle;
}

Without seeing all of your code, this may be as simple as making the Name declaration consistent on your two TextBlocks.
Note, one is Name="", the other is x:Name="".

Defining the template inline worked for me, The TitleTemplate just wouldn't work.
<phone:Pivot>
<phone:Pivot.Title>
<TextBlock Margin="0"
Text="{Binding Exercise.Name}"
Style="{StaticResource MainTitleStyle}"/>
</phone:Pivot.Title>
</phone:Pivot>