TabItem.this - multiple declarations

Function TabItem.this

this(
  string id,
  string labelRes,
  string iconRes = null,
  dstring tooltipText = null
);

Function TabItem.this

this(
  string id,
  dstring labelText,
  string iconRes = null,
  dstring tooltipText = null
);

Function TabItem.this

this(
  string id,
  UIString labelText,
  string iconRes = null,
  dstring tooltipText = null
);