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How turn on auto update content on mouse button scrolling? wpf

I use ScrollViewer. When I scroll the page with the mouse wheel, everything works fine and the ScrollChanged event cause after each scroll. But when I scroll through the contents of the panel by pressing and holding the scroll bar, then ScrollChanged cause only when I release the mouse button. How can I fix this and make it always update the content.

From Pro WPF 4.5 in C#:
Finally, the ButtonBase class adds a ClickMode property, which determines when a button fires its Click event in response to mouse actions. The default value is ClickMode.Release, which means the Click event fires when the mouse is clicked and released. However, you can also choose to fire the Click event when the mouse button is first pressed (ClickMode.Press) or, oddly enough, whenever the mouse moves over the button and pauses there (ClickMode.Hover).

scroll between grid buttons using mouse wheel in UWP

I have a UWP app in which I have several buttons. Once the app starts to run, I set the focus in my code to the first button using a code like this:
firstButton.Focus(FocusState.Programmatic);
After this point, what I am interested in is that once the user use the mouse wheel, the UWP app automatically scroll to second, third, fourth, ... button(exactly like when we use tab key on keyboard to move between buttons).
However, when I use mouse wheel, nothing happens in the app.
I should also say that in firstbutton xaml, I use pointerwheelchanged event listener to change the focus to second button. However, this event handler does not work with mouse wheel UNTIL I MOVE THE MOUSE CURSOR INSIDE THE AREA OF FIRST BUTTON. What I am interested in is that this scrolling using mouse wheel becomes automatic exactly like the tab key of keyboard.
Any suggestions?

Place the event on the container control (like the Grid). If it's a control that already processes the event, use the AddHandler method with handledEventsToo set to true.

How to catch MouseOver while the mouse is captured by another control

I have some user controls on a wpf form. I have set a trigger for them on IsMouseOverProperty so that every time the mouse is over any of them, the Background color get changed. I also have a trigger of IsPressedProperty so that every time that the user press the mouse button, the Background color get changed to another color.
Furthermore on the OnMouseLeftButtonDown event I set this. CaptureMouse() and in the OnPreviewMouseLeftButtonUp event I set this.ReleaseMouseCapture() so that when the user clicks anywhere else on the window, the the UserControl lost its mouse capture.
Every thing seems good so far unless when I press the mouse button on a user control and I move the mouse over the other user controls, their Background color never get changed because the mouse is captured by the control on which the mouse is captured.
Now I need to know is there any way to capture mouse on a user control and still be able to find if the mouse is over other controls?

Mouse middle button click functionality in Infragistics Ultragrid

In Excel, middle mouse button click work as a toggle. That is, if you press it once, it will allow you to scroll in your chosen direction till the time you click it again.
However, in Infragistics Ultragrid, this scrolling functionality is available only while middle mouse button remains pressed. How can I make Infragistics Ultragrid middle mouse button click work as in excel?
Otherwise also, what is the way to do it in winforms?

It's not as complicated as you might think. Clicking either the mouse wheel or middle button (depending on the type of Mouse the user has) fires off a MouseWheel event which must be handled and processed like any other event.
You'll need to configure a small "scrolling state machine" for you application. By this, I mean that the user is either scrolling in, say, a NormalMode, where using scroll bars or flicking up/down on the mouse wheel produces the same effect (scrolling up/down). Or, the application is in a HoverScrollingMode which occurs whenever the user has clicked the middle button (or mouse wheel) and is moving the mouse north or south of the click point.
I can't give you a programming example without seeing how your application currently handles other types of mouse events, but your overall strategy is to handle these MouseWheel events, use them to switch your application state (into, say, HoverScrollingMode) and then programmatically move the viewport up/down depending on the current position of their mouse.
Hope this helps, and good luck!

How can I move the TrackBar in response to mouse events in C#?

This is probably a n00b query. I have a need where I want to change the trackbar value based on a mouse down event. This I achieved as follows:
private void MoveTrackBarToMouseClickLocation(TrackBar a_tBar, int a_mouseX)
{
// Jump to the clicked location
double dblValue;
dblValue = ((double)a_mouseX / (double)a_tBar.Width) * (a_tBar.Maximum - a_tBar.Minimum);
a_tBar.Value = Convert.ToInt32(dblValue);
}
That part works fine. I am having trouble getting the scroll working while the mouse button is pressed. e.g. If I click on the trackbar and it takes me to say value 50 with the mouse down, I want to be able to scroll right or left (from value=50) while that mouse is down.
I hope I have made my small issue clear.
Any help is appreciated.
Thanks

You need to execute your code in the MouseMove event, as well as the MouseDown event.
This event occurs when the mouse is moved while one of the buttons is held down. In contrast, the MouseDown event that you currently handle only gets raised once each time the mouse button is pressed down. That's why the TrackBar is not moving when the user moves the mouse, but is working properly the first time the button is pressed.
You didn't show the code where you wired up the event handlers and/or call the MoveTrackBarToMouseClickLocation function, so that's as specific as I can get. But if you managed to wire up the MouseDown event already, this should be a simple fix.