GWT Hyperlink not working

I'm getting a problem with a gwt hyperlink, in fact it is not working,
Ok, when I'm placing my cursor on the hyperlink, I cannot press on the
hyperlink, it is as if a label!! :

GWT Codes:

Hyperlink hprlnkArt = new Hyperlink("Art", false, "Interest=14");
grid.setWidget(0, 6, hprlnkArt);
grid.getCellFormatter().setStyleName(0, 6, "interestBarGridSlot");
hprlnkArt.setStyleName("interestBarIcons");

Corresponding CSS Styles:

.interestBarIcons
{
width:106px;
text-align:center;
}

.interestBarGridSlot
{
background:black;

}

.interestBarGridSlot a
{
color:white !important;
font-weight:bold;
font-size:17px;
}

.InterestTitle
{
font-size:20px;
font-Weight:bold;
}

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