In the Appearance inspector you will want to check the background fill color and also adjust the padding as needed.
For a round button you can use the radius to get a round shape.
Not exactly clear on what the problem is but hope this helps.
There is also an inner and outer shadow that you may want to remove.
I am attaching an image of the problem. I have the button graphics that I created in layout mode above. Below is the container field (and I allowed the field outlines to appear) with the pasted graphics. Notice it is only the GRAPHIC that is rendering the bounding box. Nothing I do to the field appearance seems to make a dent. So far the only solution is to make rectangular button graphics with no rounded corners. Not attractive...
I personally don't use Tiff image format, in FM14 most of my graphics / icons are now SVG format
However, I always found png to be a good option for images with transparency.
Try this file, it's a quick and dirty copy of your button so may not be clean around the edges..
Does this exhibit the same behaviour?
Go to the inspector, then appearance tab, then select the fill and set to none.
I just saved the screen shot as a tiff. The graphic is actually created with all native filemaker layout tools. I don't know how those graphics are saved when pasted into a container field. I appreciate the format suggestion though and I will do a conversion and give it a go.
Looks like I got the same results with several formats (png, tiff, and whatever native tools format as)
Looks like an image format issue.
If you paste from the layout objects, it appears you lose any transparency the item may have had..
I will be honest, I didn't know you could copy layout objects and paste them into a container.. so not sure what format it is etc.
When using GetContainerAttribute( Table::Container ; "transparency" ) with the pasted in data, it returns: ?
When using the same with a png image, as expected the result is 1.
I would perhaps suggest using another tool for creating the images, there are loads of free tools such as Inkscape, Gimp etc if you don't already have something.