WebKitBrowser控件滚动到底部

Question

我正在使用WebKitBrowser控件处理一个简单的应用程序。每次更新控件的DocumentText时，如何让控件自动滚动到底部？我尝试了这段代码，但它没有工作

FreqCalcAndTransmit:
    rcall       RangeCheck      ;Range Check takes care of changing
    ldi     r17, 0xFF       ; Step sizes also
    cpsne       r23, r17
     ret
    rcall       VCODetermine

    CLR     DIVIDENDREG0, 
    lds     DIVIDENDREG1, hexResult0
    lds     DIVIDENDREG2, hexResult1   ;Divide the freq by the StepSize
    LDS     DIVIDENDREG3, hexResult2

    lds     DIVISORREG0, STEPVarHI
    lds     DIVISORREG1, STEPVar
    rcall       UDVD32

    CLR     r17
    cpsne       REMAINDERREG0, r17  ;Make sure the freq is divisible by 
     rjmp       FreqDivisible       ; the step size
    ldi     r23, 0xFF
    ret