Something

public class TabulkaUloh 
{
	private String sortColumn = null;
        private boolean sortAscending = true;
	
	
	public String getSortColumn() {
		return sortColumn;
	}

	public void setSortColumn(String sortColumn) {
		this.sortColumn = sortColumn;
	}


	public boolean isSortAscending() {
		return sortAscending;
	}


	public void setSortAscending(boolean sortAscending) {
		this.sortAscending = sortAscending;
	}

}


  <t:dataTable styleClass="standardTable"
                headerClass="standardTable_SortHeader"
                footerClass="standardTable_Footer"
                rowClasses="standardTable_Row1,standardTable_Row2"
                var="uloha"
                value="#{ulohyCol}"
         		sortColumn="#{TabulkaUloh.sortColumn}"
                sortAscending="#{TabulkaUloh.sortAscending}"
                preserveDataModel="true"
                preserveSort="true">