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Prevent Scrollbar from resizing Panel with DockStyle.Fill=true

I can't get out from my problem.
I have a panel with multiple controls and I want them be as large as the panel width.
These controls can be extended and collapsed by a clicking a button, showing or not some controls they contain.
So the I've set Dockstyle.Fill = true for the panel.
The problem is: when I click for extending one of this controls, the scroll bar is showed (and it's ok) but it automatically cause a resize of the width of the controls in the panel and it is really bad looking and slow, because I have a lot of controls!!!
I have tried adding Padding and Margin to the panel, but with no result.
I have tried making a first panel where to put the controls with a fixed width less 40px (more than the size of the scrollbar) and a fixed height with Dockstyle.Fill = false and then putting this first panel inside a parent panel with Dockstyle.Fill = true, but with no result. The scrollbar doesn't show itself when I click for extending one control.
The following one should work (i'm working on it):
the panel should have Dockstyle.Fill = none and when I click to extend or collpase the control I should also adjust the height of the panel (panel's height = heights' sum of all elements visibile in the panel)

C# FlowLayoutPanel scrollBar

I'm making an instant messaging application in C#. The problem that I'm facing right now is that for the contacts list I've made a custom control extendinguserControl, which contains aFlowLayoutPanel`.
That panel will contain a list of userControls. I want to customize the VscrollBar, but no chance (not possible). Instead I have this genius idea to hide the VscrollBar from the FlowLayoutPanel, and make simple buttons (UP and down events). For this everything worked like a charm, but when I tried to hide the VscrollBar by making the property autoScroll = false , the buttons stopped working.
How can I hide the VscrollBar?

If you want to hide the the vertical bar, there are some possible solutions. ..
You could make an event for resize, controls add, controls remove and set all the child controls' width to flowlayoutpanel.width -20
You could add a panel to the flowlayoutpanel and set it to autosize and make the panels may width to flowlayoutpanel.width-20.
You could check if the width of the flowlayoutpanel is bigger than its real width (means vscrollbar appeared) , and resize the children that it'll/ld hide again
and if you are sure that your controls are smaller than the flowlayoutpanel's width, you simply could create a panel which covers the vertical bar. (use .BringToFront() to put it before the flowlayoutpanel's scrollbar)
I hope that I understood and perhaps have solved the problem

Stop DataGridView from flowing under panel?

Question
How can I stop my datagridview from moving underneath the panel when the window is resized?
Example
What I have tried? And what I would like.
I have tried to dock the datagridview to the top on the window, but it just docks under the panel.
I have tried docking both to the top and docking one to the top and the other to the bottom, however they both just take half the screen up.
What I would like is if the datagridview docked to the bottom of the panel.

You have to modify the Anchor property on your controls. Based on what you've provided, the DataGridView control is probably anchored Bottom, Right, and you should anchor it Top, Left to match what the panel control's anchor is.
Also, if you do want the grid to be anchored to the bottom, right, you can set the MinimumSize property of your form accordingly so that it can never be resized such that the controls "collide".
It's not possible without third-party controls to dock one control to another control.

Scrollable Form in c#, AutoScroll=true doesn't work

What are the rules which I have to respect to make the Form scrollable...
I simple set the Property AutoScroll to true.
I also tried while Auto Scroll is true, to set AutoSize to true/false, but none of these worked... also tried to put Panel and added all components in there... still nothing...
Maybe using V or HScrollBar can help, but i really don't know how to link it with the Form...
form.AutoScroll = true;
formMainLayout.AutoScroll = true;
rootPanel.AutoScroll = true;

The content controls the scrolling. The scrollbars do not appear unless they are needed. Usually, there is a property available that you can set to force them to be visible always, and simply disabled until needed.
The AutoScroll property must be true, as you have already found. But then the content of the scrollable control must force the parent control to display the scrollbars. This part is up to how the controls are embedded within the parent.
Try these two experiments:
Place a Panel on your form and dock it to Fill. Set the AutoScroll property of the Panel to true. Into that panel, place a TextBox and set it to dock as Fill as well. Also set MultiLine to true. Run the application, and you will notice that the size of both is simply using the available space...no scrolling can occur because neither the Panel, nor its TextBox become larger than the space they occupy.
Perform the same steps as in #1, but this time, do not dock the TextBox. Instead, set it to a large size, something that you know will be larger than the amount of Panel that is visible. Running the application should now produce a scrolling Panel.
Hopefully this little test helps to demonstrate what is controlling the scroll on a form.

I was also having the same problem, I managed to fix it...
All the child controls inside the panel had a Left & Right anchor, and when I only set the anchor to Top, the scrollbars where working fine.
I am not sure as to why the Left and Right anchor (of the child controls) forces the panel not to show scrollbars.
But anyways... hope this will help anyone as of this date.

The AutoScroll property should work fine, but most likely you are not using it right: the bar appears only when required. Example: minimum Y of the Form is 0 and minimum Y of one of the controls in it (a TextBox) is -20.
If you want to include a scroll bar no matter what (controls inside the boundaries of the form or not), you can also do it. Sample code (from MSDN) for a vertical scroll bar:
// Create and initialize a VScrollBar.
VScrollBar vScrollBar1 = new VScrollBar();
// Dock the scroll bar to the right side of the form.
vScrollBar1.Dock = DockStyle.Right;
// Add the scroll bar to the form.
Controls.Add(vScrollBar1);

You need to set the properties for the parent panel.
Dock = Fill
Anchor = Top, Left
AutoScroll = true
That's it. Good luck! ^^

note its for vertical scroll
Turn On auto scroll property of your Form. insert one panel and
set panel width to the form width and panel height
equal to length of your total content or may be 1300 or 1500 as
required.
Place panel location as you want set panel anchor
property to top. place your all
content inside panel.
hope it will solve your problem

I had the same problem.
You have to add only this:
this.AdjustFormScrollbars(true);

Scrollbar does not appear on Panel when lines drawn on it (C#)

I want to draw some lines and rectangles on a panel. Sometimes it does not fit in panel
and I want the scroll bar to appear. I set AutoScroll property to true, but it doesn't work ;(

Set the panel's AutoScrollMinSize property to a something larger than the panel's real dimensions (for example, if your panel is 300 x 200, set the AutoScrollMinSize property to 900 x 600). This will cause both scrollbars to appear, and you should be able to draw on the larger surface.

You will need to tell the panel control that you are drawing outside of the visible bounds by setting the AutoScrollMinSize property. But another, perhaps simpler, solution would be to have your panel contain another panel control in which you do the drawing. Then you can simply resize that inner panel to fit your drawing and the outer panel will automatically provide the scrolling as necessary.