I am not quite sure I understand your scenario completely. That is why, in case the information below does not help you, please provide detailed information on the result you are trying to implement.
We have a RadTimeline control that visualizes events on a timeline. You can review our online demos
in order to get familiar with the control itself. RadTimeline does not support drag-and-drop out of the box, but you could integrate it with our DragAndDropManager
We also have a RadSlider control - here are links to its demos
Another control that you can review is our RadGanttView - demos
Please note that I provided links to our Silverlight demos, but the demos and the code of the demos is the same for both Silverlight and WPF. You can find our WPF demos here