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C# Winform how to allow panel draw outside the panel's parent?

I have created a form that shows data and the filter that has checkbox in it
combobox
I have used a Button and a Panel to do this and found that the panel is only shown in the parent's panel not float like the combobox
or panel can't do like this?
Regards

You want something that cannot be done with parented components (like panels)
I see some options:
(1) owner draw a combobox to include checkboxes, see Codeprojects https://www.codeproject.com/Articles/31105/A-ComboBox-with-a-CheckedListBox-as-a-Dropdown
or
(2) Create a small floating popup form without system menu and a single pixel border. Inside the form, you could place a CheckListBox docked Fill to allow for filter checkboxes for each item.. you may have a look at this topic Is there a simple way to implement a Checked Combobox in WinForms
(3) Both solutions have drawbacks. Actually it may be better to avoid it, find another way to specify your filter options, redesign your UI.

Having a certain layout when adding labels to a Panel

I have a WinForm with a Panel and I keep adding Labels to it. Is it possible to set the Panel so that everytime I add a label it will have a certain layout ? The layout I am looking for is having a single column of Labels, so everytime I add a new Label it will be added to the next row. I haven't found any property for the Panel to do that. Is this possible ?

Use FlowLayoutPanel instead of Panel. And set the FlowDirection property to TopDown

You can create a ListBox in the panel, and then add the Labels to it, rather than to panel directly.

Use a TableLayoutPanel and set its ColumnCount to 1.

Referenced custom control for windows form groupbox displays incorrectly

So the custom control form looks like this:
http://imgur.com/7Udg7wd,0PivXdl,4fHdmGt
However, whenever I reference this custom control, OAuthControl.cs, the groupbox of which the buttons and textboxes are organized under displays incorrectly. Here is a picture:
http://imgur.com/7Udg7wd,0PivXdl,4fHdmGt#1
I tried changing the margin and padding properties for that groupbox and only got it to partially display more of the bottom half.
What can I change to make each control that I reference in a new form to conform to the original control design?

Sorry, I can't comment under your question.
Probably is related to Anchor (I immagine that buttons ar anchored) or something you do in OAuthControl.cs
Could you post it?

Adding panels to SplitContainer in Windows Forms

I'm having trouble finding the documentation on how to add panels to a SplitContainer. I can create the SplitContainer fine, but I can't put the panels I've coded inside of the splitcontainer.
I've tried doing
sc.Container.Add(myPanel);
sc.Container.Add(myOtherPanel);
But Container is always null. Does anyone know what I'm doing wrong?

The SplitContainer always contains two panels and you cannot change that! (And you don't need to add any panels yourself.)
You can access the two panels through the properties Panel1 and Panel2.
If you need more panels, you can however nest several SplitContainers.
UPDATE
You cannot replace the existing panels. What you can do, is to place your own controls on the existing split container panels (and your controls can also be System.Windows.Forms.Panels containing other controls or user defined controls):
sc.Panel1.Controls.Add(myPanel);
sc.Panel2.Controls.Add(myOtherPanel);
myPanel.Dock = DockStyle.Fill;
myOtherPanel.Dock = DockStyle.Fill;
Of course you can add them using the forms designer of Visual Studio of as well, if you don't have a scenario where you have to add controls dynamically. If you create your own controls, they will automatically appear in the Toolbox inside of the same project and you can just drag and drop them on the SplitContainer's panels.

The SplitContainer control already has two panels named Panel1 and Panel2. Select the panel you want to use:
sc.Panel1.Controls.Add(myPanel);
sc.Panel2.Controls.Add(myOtherPanel);

Adding to a Scrollable Panel with Location

I am using a Panel to hold a list of controls (user-defined). The way that I add the panels, I am setting the location of the control based on the Panel.Controls.Count before I add it to the panel.
comRec.Location = new Point(comRec.Location.X, panel1.Controls.Count * 25);
panel1.Controls.Add(comRec);
Now, this works nicely and looks exactly the way that I want it to. However, once we reach the limit on the window, the AutoScroll enables (which I do want). Now, if the user were to scroll to the bottom of the Panel, this ultimately changes the location of every control in the panel. Instead of my first comRec.Location being (0,0), it is something like (0,-219). So now, when the user adds another comRec object, it creates a HUGE gap between the objects.
My question is this, what is the best way to account for the changes of the location with the scrollbar and still using my adding system. I am assuming that will have to do something with checking the value of the scrollbar and using it to determine the location.
Also, is there a BETTER way to display a list of controls? Should I be using a Panel?

Look at the FlowLayoutPanel control, it's exactly what you what.

You could add an additional panel into the hierarchy:
Outer panel (scrollable)
Inner panel (not scrollable, resize it whenever you add a control)
User Defined Control 1
User Defined Control 2
User Defined Control 3
User Defined Control 4
...
This way, your additional controls' locations would be relative to their direct parent, the non-scrolling panel.

If you add several controls, try to suspend the layout of the panel while adding the controls:
panel1.SuspendLayout();
// Add controls ...
panel1.ResumeLayout();
This helped me in a similar situation where the user could change dynamically the visibility of existing controls.