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UserControls not rendering

Okay, to start, I'm pretty inexperienced with WPF and XAML, so any pointers or advice would be greatly appreciated.
I have a scheduling program that I'm working on that I need some help setting up. I had things working previously, but it wasn't organized correctly. I had UI elements in my ViewModels that I would add to a StackPanel at the initialization of the MainWindow. Generally not MVVM style coding. So I made some views (UserControls) to display the things I have, and most everything broke.
Basically, I have a Schedule ViewModel that has some parameters and a list of a different Room ViewModels. Each Room ViewModel has a RoomSchedule ViewModel that contains a list of RoomEvent ViewModels.
I'm trying to write controls for the things that need displaying. I've created a Schedule view, which has a list box of Room views, and the Room view uses the RoomEvent view to display the events of the room. The Room view uses the WPF Extended Toolkit's TimelinePanel, the rest of the controls are pretty much basic controls. The general idea has been: a model provides data to the ViewModel, which massages that data to what needs to be displayed. So an Event should know how to display itself, a Room should know how to display itself, and the Schedule should know how to display itself.
The problem I'm running into is: now that I've scooted everything from the xaml.cs or ViewModel files to their appropriate places, the controls aren't rendering at all. I've been reading other SO postings where people have the same problem, but none of them seem to work for beginner stuff like this. I think I'm close, it seems like all the controls are being created, and the DataContext's are being set correctly, but nothing is showing up.
This is, basically, what I have so far. I left some of the xaml boilerplate stuff off for succinctness:
Schedule.xaml:
<StackPanel>
<ListBox ItemsSource="{Binding Rooms}" >
<ListBox.ItemTemplate>
<DataTemplate>
<localcontrols:RoomView ScheduleStart="{Binding ElementName=ScheduleControl, Path=DataContext.Start}"
</DataTemplate>
<ListBox.ItemTemplate>
</ListBox>
</StackPanel>
RoomView.xaml:
<extended:TimelinePanel BeginDate="{Binding localcontrols:ScheduleStart}" EndDate="{Binding localcontrols:ScheduleEnd}"
<ItemsControl ItemsSource="{Binding Path=mRoomSchedule.mScheduledEvents}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<localcontrols:EventView />
</DataTemplate>
</ItemsControls.ItemTemplate>
</ItemsControl>
</extended:TimelinePanel>
EventView.xaml:
<Border BorderThickness="1" BorderBrush="Black" extended:TimelinePanel.Date="{Binding mStartTime}" extended:TimelinePanel.DateEnd="{Binding mEndTime}">
<TextBlock Background="{Binding mColor}" Text="{Binding mEventID}" />
</Border>
The ScheduleStart and ScheduleEnd are dependency properties defined in RoomView.xaml.cs. My thinking was that Schedule would have Start and End properties that would be set in its constructor, and the RoomViews in the ListBox would bind to those properties to set the TimelinePanel's BeginDate and EndDate.

Maybe your bindings are wrong. When I need to bind to a dependency property I use the ElementName feature of binding to say which control I want and I give the root node a name, in this case Root. It's one way to solve it.
<UserControl
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"
xmlns:local="clr-namespace:Weingartner.Controls"
x:Class="RoomView"
x:Name="Root">
<extended:TimelinePanel
BeginDate="{Binding ElementName=Root, Path=ScheduleStart}"
EndDate="{Binding ElementName=Root, Path=ScheduleEnd}"
>
<ItemsControl ItemsSource="{Binding Path=mRoomSchedule.mScheduledEvents}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<localcontrols:EventView />
</DataTemplate>
</ItemsControls.ItemTemplate>
</ItemsControl>
</extended:TimelinePanel>
</UserControl>

How to UWP Print ListView ItemTemplate

I'm trying to figure out how to print a ListView ItemTemplate using the uwp PrintHelper.cs sample. Everything works, except the print preview does not display items added to the ListView at runtime. I can add other controls such as a textbox, and the print preview will show it, so there must be something peculiar with printing databound ListView items at runtime, but I cannot find any information about it.
<ListView x:Name="ClipboardList"
xmlns:m="using:QuickieEdit.Models"
ItemsSource="{x:Bind ViewModel.MemoryItems}">
<ListView.ItemTemplate>
<DataTemplate x:DataType="m:MemoryItem">
<StackPanel Orientation="Horizontal">
<Button x:Name="MemoryCopyBtn"
Content="Copy"
Click="How to Copy currently selected
MemoryListItem.Text?"/>
<TextBox x:Name="MemoryListItem"
Text="{x:Bind Memory, Mode=TwoWay}">
</TextBox>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>

I cannot understand your exact query, but I think you may be facing situation where your ListView does not get updated with the model and hence does not show up while printing. You can use
ObservableCollection<Model> instead of List<Model>
This will solve your problem or if it does not please provide the c# code in detail as well
Cheers

DataTemplate not able to resolve DataType prefix data

I'm trying to implement ListView in UWP using Window's sample code.
<ListView.GroupStyle>
<GroupStyle >
<GroupStyle.HeaderTemplate>
<DataTemplate x:DataType="data:GroupInfoList">
<TextBlock Text="{x:Bind Key}"
Style="{ThemeResource TitleTextBlockStyle}"/>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
The line -
DataTemplate x:DataType="data:GroupInfoList"
Is giving me error, shown in the left image, When creating models am I suppose to create them differently.It says
The namespace prefix "data" is not defined.
Is it a namespace that I need to include?

In your case data:GroupInfoList is the type GroupInfoList in the namespace mapping data.
You have to define the namespace mapping before you can use it.
In the Page element of SimpleListViewSample you should have something like this:
<Page
x:Class="HermantsListV2.Sample.SimpleListViewSample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:data="HermantsListV2.Model">
...
(Notice the xmlns:data="HermantsListV2.Model mapping.)
Just replace the namespaces in the example above with the right ones from your project and it should work.

It is a bug in the Visual Studio 2015 to solve it just comment that part of the code and run it. after that uncomment it and it will run without any error.
1- Comment this part of the code:
<!--<DataTemplate x:DataType="data:GroupInfoList">
<TextBlock Text="{x:Bind Key}"
Style="{ThemeResource TitleTextBlockStyle}"/>
</DataTemplate>-->
2- run your app.
3- uncomment this part of code:
<DataTemplate x:DataType="data:GroupInfoList">
<TextBlock Text="{x:Bind Key}"
Style="{ThemeResource TitleTextBlockStyle}"/>
</DataTemplate>
4- run the app.

I have just had the same issue, this page was copied/pasted from the Universal ListView sample.
The pasted page was full of bad characters, such as line feeds etc. I cleaned the page by removing lines and line feeds around the data template and all is fine.

I've managed to get this working sometimes if you cut the code inside your gridview etc then save, build and paste it back. Not sure why, but it fixes it sometimes, maybe VS makes something hidden there.

Synchronize generated items from ItemsSource

I'm looking for an easy way to synchronize Text sizes (Button Content), which are generated by an ItemsControl.
I'm using the following Xaml code:
<ItemsControl ItemsSource="{Binding UseCases}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Button Content="{Binding DisplayName}" Width="200" Height="200">
<Button.ContentTemplate>
<DataTemplate>
<Viewbox>
<ContentPresenter Content="{Binding}" />
</Viewbox>
</DataTemplate>
</Button.ContentTemplate>
</Button>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
I want to make the text on the buttons as big as possible, which already works.
But since the text length is different, the text sizes for each button is also different, which looks odd.
Is there a simple way to tell the Viewbox (or any other way) to take the size of the smallest text and use it for every button?

to limit the size of text just use Padding:
Handling text overflow is the complex part. By some reason (the culprit is - ButtonChrome) the button won't take 'TextBlock.TextTrimmingProperty' attached property, however the AttachedProperty mechanism is designed specifically for the cases like that), leaving you with two options:
Override button's template, lookup for ButtonChrome, get rid of it and replace with something, which has a TextBlock, bind that TextBlock's text to ContentControl.Content.
Manage your text overflow by yourself. Sibscribe for SizeChanged event, get size from the event argument (it mightn't be available anywhere else), get the padding and figure out if text exceeds the available size. Replace the excessive part of it with "..".
The moral - not worth doing.
I'd create uniform quadratic launch buttons and put labels beside them.

AutoCompleteBox in silverlight toolkit for windows phone wrong display

I'm having a problem with the autocompletebox from the toolkit for windows phone. I bind it to some data, then when i press it and start typing, it discovers some items but they are displayed wrong (the list is shown separated from the box, and also if i click on any item, nothing happens. If i click where the item would be supposed to be (for example, right on the top of the box), then it gets selected. It looks like a rendering problem (bug?)) but perhaps i'm doing something wrong. Here's the code for the box :
<DataTemplate x:Key="DataTemplate1">
<ContentControl Content="{Binding Name}" Margin="8,7"/>
</DataTemplate>
<toolkit:AutoCompleteBox ItemsSource="{Binding}" x:Name="txtSelectValues" MinWidth="250" Margin="0,0,0,0" ItemTemplate="{StaticResource DataTemplate1}" VerticalAlignment="Top" />

Found it. It's a bug with the AutoCompleteBox. When inside a scrollviewer control, the dropdown gets messed up and displayed in an incorrect position

Its not just that is also to do with being placed inside of a Pivot/Panaroma as well as the scrollviewer, the silverlight gurus have stated they haven't a timeline for the fix for the Pivot control, and there is a nasty hack
http://silverlight.codeplex.com/workitem/7574

I think the answer might just be that you shouldn't be using a ContentControl directly used like this. Try using something like a TextBlock instead - e.g.:
<DataTemplate x:Key="DataTemplate1">
<TextBlock Text="{Binding Name}" Margin="8,7"/>
</DataTemplate>
If that's not the answer, then try pulling back to a simple example - especially removing all the Margin's, Width's, Alignment's, etc - then put them back in one-by-one to work out and understand what is causing the effect you are seeing.