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Column Type button

Hi,

I have a column with type button and its header name is blank. The display and functionality works perfect, but when i move the mouse on that column header the border of the header for that column is highlighted with black colour or dotted line. This problem happens only in case of the column type button, for other columns other than buttons this issue does not arise.Can you please tell me what the problem might be and how do I fix it ?

Grid has not any special code which can cause such effect in header ( styles of header must not be affected by mouse hovering in any scenario ) 
Most probably issue caused by some kind of global mouse action handler used on the same page. 

If issue still occurs - please provide any kind of sample or demo link where problem can be reconstructed ( you can send such kind of info directly to support@dhtmlx.com )