You'll see addition lines (also called "frames") around the new layer. Simply Edit > Deselect and they'll be gone.
After every layer added, always remove the frames before any movement with Object Align OR Drop Shadow. This ensures all of the element is moved OR that the drop shadow is even and not cut off.
At this point, name your design and save as a .psd extension then continue until the design is completed.
Here's what I came up with:
When using tubes, ALWAYS credit the designer who created the tube, with a current URL, when crediting the designer.
If the elements you are using are smaller than the canvas you've created, you can simply add them by doing the following:
I then cropped and came up with this:
This is how I made th same screen shot look like one!